Adaptive compression system for radio frequency coil assembly

Abstract

An RF receive coil assembly for an MRI system includes a flexible housing and an RF coil disposed within the flexible housing. The flexible housing is configured to be disposed on a first side of a portion of a subject to be imaged. The RF receive coil assembly further includes an adaptive compression system. The adaptive compression system includes a flexible retention element separate from the flexible housing, the flexible retention element configured to be disposed on a second side of the portion of the subject. The adaptive compression system also includes at least one strap coupled to both the flexible housing and the flexible retention element. The adaptive compression system includes a tension adjustment mechanism coupled to the at least one belt and configured to adjust a tension of the at least one belt to adjust a degree of tension of the flexible housing disposed around the portion of the subject to be imaged.

Description

Background Art

[0001] The subject matter disclosed herein relates to medical imaging, and more particularly to an adaptive compression system for a radio frequency (RF) coil assembly for a magnetic resonance imaging (MRI) system.

[0002] Non-invasive imaging techniques allow images of internal structures or features of a patient / object to be obtained without performing an invasive procedure on the patient / object. Specifically, such non-invasive imaging techniques rely on various physical principles (such as differential transmission of X-rays through a target volume, reflection of acoustic waves within a volume, paramagnetism of different tissues and materials within a volume, decomposition of target radionuclides within the body, etc.) to acquire data and construct an image or otherwise represent the observed internal features of the patient / object.

[0003] During magnetic resonance imaging, when a substance such as human tissue is subjected to a uniform magnetic field (polarization field B0), the individual magnetic moments of the spins in the tissue attempt to align with the polarization field, but precess around it in a random order at their characteristic Larmor frequency. If the substance or tissue is subjected to a magnetic field (excitation field B1) that is in the xy plane and close to the Larmor frequency, the net alignment moment or "longitudinal magnetization" M z can be rotated or "tilted" into the xy plane to produce a net transverse magnetic moment M t After the excitation signal B1 is terminated, a signal is emitted by the excited spins and can be received and processed to form an image.

[0004] When these signals are used to generate images, the magnetic field gradient (G x , G y and G z ). Typically, the area to be imaged is scanned in a series of measurement cycles in which these gradient fields are varied according to the particular localization method used. The resulting set of received nuclear magnetic resonance (NMR) signals is digitized and processed to reconstruct an image using one of the well-known reconstruction techniques.

[0005] The current technology or mechanism for holding a coil (e.g., a body coil) to a patient is by using a hook-and-loop fastening strap that wraps around the patient, varying rigid positioners, and / or foam supports. These straps are difficult to use, difficult to position, and often degrade over time. In addition, these straps do not effectively account for contoured surfaces such as shoulders, breasts, ankles, hips, and related areas. Due to varying anatomical dimensions (e.g., varying chest size or patient size) or medical conditions (e.g., having a mastectomy), straps or other positioners do not provide optimal retention of the coil to the body. Summary of the invention

[0006] The following shows an overview of certain embodiments disclosed herein. It should be understood that these aspects are provided only to provide the reader with a brief overview of these specific embodiments, and these aspects are not intended to limit the scope of the present disclosure. In fact, the present disclosure may cover various aspects that may not be shown below.

[0007] In one embodiment, a radio frequency (RF) receiving coil assembly for a magnetic resonance imaging (MRI) system is provided. The RF receiving coil assembly includes a flexible housing. The RF receiving coil assembly also includes a radio frequency coil disposed within the flexible housing, wherein the radio frequency coil includes a plurality of flexible loops having a ductile conductor. The flexible housing is configured to be disposed on a first side of a portion of a subject to be imaged. The RF receiving coil assembly further includes an adaptive compression system. The adaptive compression system includes a flexible retaining element separated from the flexible housing, the flexible retaining element being configured to be disposed on a second side of the portion of the subject to be imaged. The adaptive compression system also includes at least one belt, the at least one belt being coupled to both the flexible housing and the flexible retaining element. The adaptive compression system further includes a tension adjustment mechanism, the tension adjustment mechanism being coupled to the at least one belt and being configured to adjust the tension of the at least one belt to adjust the tightness with which the flexible housing is disposed around the portion of the subject to be imaged.

[0008] In another embodiment, a radio frequency (RF) receiving coil assembly for a magnetic resonance imaging (MRI) system is provided. The RF receiving coil assembly includes a flexible housing. The RF receiving coil assembly also includes a radio frequency coil disposed within the flexible housing, wherein the radio frequency coil includes a plurality of flexible loops having a ductile conductor. The flexible housing is configured to be disposed on a first side of a portion of a subject to be imaged. The RF receiving coil assembly further includes an internal adaptive compression system. The internal adaptive compression system includes a flexible retaining element separated from the flexible housing, the flexible retaining element being configured to be disposed on a second side of the portion of the subject to be imaged. The internal adaptive compression system also includes a rope coupled to both the flexible housing and the flexible retaining element, wherein at least a portion of the rope is disposed within the flexible housing. The internal adaptive compression system further includes a tension adjustment mechanism coupled to the rope and configured to adjust the tension of the rope to adjust the tightness with which the flexible housing is disposed around the portion of the subject to be imaged.

[0009] In a further embodiment, a radio frequency (RF) receiving coil assembly for a magnetic resonance imaging (MRI) system is provided. The RF receiving coil assembly includes a flexible housing. The RF receiving coil assembly also includes a radio frequency coil disposed within the flexible housing, wherein the radio frequency coil includes a plurality of flexible loops having a ductile conductor. The flexible housing is configured to be disposed on a chest having a breast of a subject to be imaged. The RF receiving coil assembly also includes an integral adaptive compression system. The integral adaptive compression system is configured to enable positioning of the flexible housing around breasts of different sizes. The integral adaptive compression system includes a flexible retaining element separated from the flexible housing, the flexible retaining element being configured to be disposed on the back of the subject to be imaged. The integral adaptive compression system also includes a rope connected to both the flexible housing and the flexible retaining element, wherein the rope includes a first mesh rope region disposed within the flexible housing and a second mesh rope region disposed within the flexible housing, the first mesh rope region and the second mesh rope region being configured to be disposed around respective ones of the breasts, respectively. The integrated adaptive compression system further includes a tension adjustment mechanism coupled to the cable and configured to adjust the tension of the cable to adjust the tightness with which the flexible housing is disposed about the chest of the subject to be imaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] These and other features, aspects, and advantages of the present subject matter will be better understood when the following detailed description is read with reference to the accompanying drawings, in which like characters refer to like parts throughout the several views, and in which:

[0011] Figure 1 An embodiment of a magnetic resonance imaging (MRI) system suitable for use with the disclosed technology is illustrated;

[0012] Figure 2 is a schematic diagram of a radio frequency (RF) coil assembly to be used with an adaptive compression system or an integrated positioning system according to aspects of the present disclosure;

[0013] Figure 3 is a schematic diagram of a cross section of a radio frequency coil according to aspects of the present disclosure;

[0014] Figure 4 is a schematic diagram of a body coil with an adaptive compression system or an integrated positioning system according to aspects of the present disclosure;

[0015] Figure 5 According to various aspects of the present disclosure, Figure 4 Schematic diagram of a body coil of an adaptive compression system or an integrated positioning system;

[0016] Figure 6 According to various aspects of the present disclosure Figure 5 A schematic diagram of a portion of an adaptive compression system and an integrated positioning system in;

[0017] Figure 7 A device is provided around a subject to be imaged according to aspects of the present disclosure. Figure 5 A schematic diagram of a portion of an adaptive compression system or an integrated positioning system in;

[0018] Figure 8 According to various aspects of the present disclosure Figure 5 A schematic diagram of a portion of an adaptive compression system or an integrated positioning system (e.g., having a multi-piece flexible retaining element);

[0019] Fig. 9 is a schematic diagram of a portion of a tension adjustment mechanism according to aspects of the present disclosure;

[0020] Fig.10 The invention is a device according to aspects of the present disclosure having a device disposed on a chest area (eg, having a breast) of a subject. Figure 4 Schematic diagram of a top view of a body coil of an adaptive compression system or an integrated positioning system (e.g., configured for use with a breast);

[0021] Fig.11 According to various aspects of the present disclosure, Fig.10 a schematic diagram of a rear view of a body coil of an adaptive compression system or an integrated positioning system in; and

[0022] Fig.12 is a schematic diagram of a radio frequency (RF) coil assembly to be used with an adaptive compression system or an integrated positioning system (eg, with a flexible housing having an opening) according to aspects of the present disclosure. DETAILED DESCRIPTION

[0023] One or more specific embodiments will be described below. In order to provide a concise description of these embodiments, not all features of an actual implementation are described in the specification. It should be understood that in the development of any such actual implementation, as in any engineering or design project, many implementation-specific decisions must be made to achieve the developer's specific goals, such as complying with system-related and business-related constraints that may vary from implementation to implementation. In addition, it should be understood that such development efforts may be complex and time-consuming, but are still routine tasks for design, fabrication, and manufacturing for ordinary technicians who benefit from this disclosure.

[0024] When introducing elements of various embodiments of the present subject matter, the articles "a," "an," "the," and "said" are intended to indicate that there are one or more elements. The terms "comprising," "including," and "having" are intended to be inclusive, and mean that there may be additional elements in addition to the listed elements. Furthermore, any numerical examples in the following discussion are intended to be non-limiting, and thus the additional numerical values, ranges, and percentages are within the scope of the disclosed embodiments.

[0025] The present disclosure provides an embodiment of an adaptive compression system (e.g., an integrated adaptive compression system) or an integrated positioning system for holding a body coil (e.g., a radio frequency coil assembly or a radio frequency receiving coil) on a subject to be imaged. Specifically, the adaptive compression system utilizes a tightening technology that utilizes an elastic rope or belt (a portion of which is integrated or disposed within a flexible housing of the body coil) and a flexible retaining element. When the rope or belt is pulled, the body coil (in the flexible housing) and the retaining element are pulled closer together, thereby holding the body coil to the body. The adaptive compression system is adjustable so that the body coil can be tightened or loosened as needed, while the rope layout allows for custom contours around a wide range of anatomical regions. Although discussed in the context of use with a body coil, the adaptive compression system can be used with other articles or devices (e.g., conformal flight vests or other close-fitting garments).

[0026] The disclosed embodiments benefit the subject (e.g., patient) to be imaged by providing a more comfortable positioning of the body coil on the body. The tether can be loosened or repositioned as needed to enable imaging and patient comfort. The disclosed adaptive compression system can be oriented in different positions. The disclosed adaptive compression system can be used with a body coil in a single base, or with modular insertables customized for the patient. The adjustable size of the adaptive compression system will allow for adjustment of the tissue while allowing the tissue to be freely suspended.

[0027] Compared to existing straps and positioning systems, the disclosed embodiments provide a much faster and streamlined construction. Thus, setup time is reduced and throughput for using a magnetic resonance scanner can be increased. Moreover, the need to use bulk positioners is eliminated. For a healthcare provider (e.g., a hospital or imaging center), when components of the adaptive compression system (e.g., ropes) degrade, they can be easily removed and replaced with new ropes. In addition, from a safety perspective, the tightened body coil can be placed closer to the body, away from the orifice of the magnetic resonance scanner. Therefore, the body coil is less likely to be as hot (e.g., due to field inhomogeneities at the edges of the orifice). This is particularly useful for sites of anatomical structures that are already close to the orifice (such as shoulders and hips).

[0028] The disclosed embodiments improve image quality due to a higher signal-to-noise ratio because the loops of the body coil will be closer to the body. The disclosed adaptive compression system is easier to maintain and clean.

[0029] The disclosed embodiments can be used for a variety of different applications and a variety of different body designs (e.g., head, breast, etc.). For example, the disclosed embodiments can be used for pediatric patients because they are easy to fit around the body. Specifically, the disclosed embodiments can be used to wrap newborns or children, thereby reducing a large number of straps and constraints that may be emotionally burdensome to parents. In another example, the disclosed embodiments can be used with breasts. Specifically, for patients of different sizes and cup sizes, the body coil can be pulled closer to the body. The adaptive compression system can be implemented to keep larger chest sizes more centered when positioned supine, or to keep the flexible body coil in place when used in a ventral position. The adaptive compression system can be used to treat subjects who have undergone mastectomy. In a further example, the disclosed embodiments can be used for hip or shoulder retention. Specifically, the coil is pulled closer around a curved surface. The disclosed embodiments can be used for different body types and shapes.

[0030] In certain embodiments, a radio frequency (RF) receiving coil assembly for a magnetic resonance imaging (MRI) system includes a flexible housing. The RF receiving coil assembly also includes a radio frequency coil disposed within the flexible housing, wherein the radio frequency coil includes a plurality of flexible loops having a ductile conductor. The flexible housing (and the radio frequency coil) are configured to be disposed on a first side of a portion of a subject to be imaged. The RF receiving coil assembly further includes an adaptive compression system. The adaptive compression system includes a flexible retaining element separated from the flexible housing, the flexible retaining element being configured to be disposed on a second side of the portion of the subject to be imaged. The adaptive compression system also includes at least one belt, the at least one belt being coupled to both the flexible housing and the flexible retaining element. The adaptive compression system further includes a tension adjustment mechanism, the tension adjustment mechanism being coupled to the at least one belt and being configured to adjust the tension of the at least one belt to adjust the tightness of the flexible housing (and the radio frequency coil) disposed around the portion of the subject to be imaged.

[0031] In some embodiments, at least a portion of at least one belt is disposed within the flexible housing. In some embodiments, a tension adjustment mechanism is coupled to at least one belt outside the flexible housing. In some embodiments, the tension adjustment mechanism is configured to pull the flexible housing and the flexible retaining element closer together around the portion of the subject to be imaged via at least one belt. In some embodiments, at least one belt includes a first belt and a second belt, the first belt and the second belt are coupled to both the flexible housing and the flexible retaining element. In some embodiments, the flexible housing includes a first end and a second end opposite to the first end, the first belt and the second belt are disposed closer to the first end and the second end, respectively, and the tension adjustment mechanism is coupled to both the first belt and the second belt and is configured to adjust the tension of both the first belt and the second belt. In some embodiments, at least one belt is configured to be removed and replaced. In some embodiments, at least one belt includes twine, elastic cord, or elastic cord. In some embodiments, the tension adjustment mechanism includes a turntable coupled to a reel, wherein the turntable is configured to be rotated to wind at least one belt around the reel to tighten the flexible housing around the portion of the subject to be imaged. In some embodiments, the tension adjustment mechanism includes a cord lock stopper. In certain embodiments, the adaptive compression system is configured to enable positioning of the curved surface of the flexible housing around different locations of the subject's anatomy to be imaged.

[0032] In certain embodiments, a radio frequency (RF) receiving coil assembly for a magnetic resonance imaging (MRI) system includes a flexible housing. The RF receiving coil assembly also includes a radio frequency coil disposed within the flexible housing, wherein the radio frequency coil includes a plurality of flexible loops having a ductile conductor. The flexible housing (and the radio frequency coil) are configured to be disposed on a first side of a portion of a subject to be imaged. The radio frequency receiving coil assembly further includes an internal adaptive compression system. The internal adaptive compression system includes a flexible retaining element separated from the flexible housing, the flexible retaining element being configured to be disposed on a second side of the portion of the subject to be imaged. The internal adaptive compression system also includes a rope, the rope being coupled to both the flexible housing and the flexible retaining element, wherein at least a portion of the rope is disposed within the flexible housing. The internal adaptive compression system further includes a tension adjustment mechanism, the tension adjustment mechanism being coupled to the rope and being configured to adjust the tension of the rope to adjust the tightness of the flexible housing (and the radio frequency coil) disposed around the portion of the subject to be imaged.

[0033] In certain embodiments, a radio frequency (RF) receiving coil assembly for a magnetic resonance imaging (MRI) system is provided. The RF receiving coil assembly includes a flexible housing. The RF receiving coil assembly also includes a radio frequency coil disposed within the flexible housing, wherein the radio frequency coil includes a plurality of flexible rings having a ductile conductor. The flexible housing (and the radio frequency coil) are configured to be disposed on a chest having a breast of a subject to be imaged. The RF receiving coil assembly also includes an integral adaptive compression system. The integral adaptive compression system is configured to enable positioning of the flexible housing around breasts of different sizes. The integral adaptive compression system includes a flexible retaining element separated from the flexible housing, the flexible retaining element being configured to be disposed on the back of the subject to be imaged. The integral adaptive compression system also includes a rope, the rope being coupled to both the flexible housing and the flexible retaining element, wherein the rope includes a first mesh rope region disposed within the flexible housing and a second mesh rope region disposed within the flexible housing, the first mesh rope region and the second mesh rope region being configured to be disposed around respective breasts in the breasts, respectively. The integrated adaptive compression system further includes a tension adjustment mechanism coupled to the cable and configured to adjust the tension of the cable to adjust the tightness with which the flexible housing (and the RF coil) is disposed about the chest of the subject to be imaged.

[0034] Considering the above, Figure 1 , a magnetic resonance imaging (MRI) system 100 is schematically illustrated as including a scanner 102, scanner control circuitry 104, and system control circuitry 106. According to embodiments described herein, the magnetic resonance imaging system 100 is generally configured to perform MR imaging.

[0035] The system 100 also includes a remote access and storage system or device, such as a picture archiving and communication system (PACS) 108, or other devices, such as teleradiology equipment, that enable on-site or off-site access to data acquired by the system 100. In this way, MR data can be acquired and then processed and evaluated on-site or off-site. Although the magnetic resonance imaging system 100 can include any suitable scanner or detector, in the illustrated embodiment, the system 100 includes a whole body scanner 102 having a housing 120 through which an aperture 122 is formed. A diagnostic table 124 can be moved into the aperture 122 to allow a patient 126 to be positioned therein so as to image selected anatomical structures within the patient's body.

[0036] The scanner 102 includes a series of associated coils for generating a controlled magnetic field, which is used to excite gyromagnetic materials within the anatomical structure of the subject being imaged. Specifically, a primary magnetic coil 128 is provided for generating a primary magnetic field B0 that is generally aligned with the orifice 122. A series of gradient coils 130, 132, and 134 allow the generation of controlled gradient magnetic fields during the examination sequence for position encoding of certain gyromagnetic nuclei in the patient 126. A radio frequency (RF) coil 136 (e.g., a radio frequency transmission coil) is configured to generate radio frequency pulses for exciting certain gyromagnetic nuclei in the patient. In addition to the coils that may be located locally in the scanner 102, the system 100 also includes a set of receiving coils or radio frequency receiving coils 138 (e.g., a coil array) configured to be placed proximal to the patient 126 (e.g., against the patient). For example, the receiving coil 138 may include a cervical / thoracic / lumbar (CTL) coil, a head coil, a single-sided spine coil, etc. Generally, the receive coil 138 is placed near or on top of the patient 126 to receive the weak RF signals (relative to the transmit pulses generated by the scanner coil) generated by certain gyromagnetic nuclei in the patient's body when the patient 126 returns to his or her relaxed state.

[0037] The various coils of the system 100 are controlled by external circuitry to generate the required fields and pulses and to read the emission from the gyromagnetic material in a controlled manner. In the illustrated embodiment, the main power supply 140 provides power to the primary field coil 128 to generate the primary magnetic field Bo. The power input (e.g., power from a utility or grid), a power distribution unit (PDU), a power supply (PS), and a drive circuit 150 can provide power together to pulse the gradient field coils 130, 132, and 134. The drive circuit 150 may include an amplification and control circuit system for supplying current to the coils as defined by the digitized pulse sequence output by the scanner control circuit system 104.

[0038] Another control circuit 152 is provided for regulating the operation of the radio frequency coil 136. The circuit 152 includes a switching device for alternating between an active mode of operation and a passive mode of operation, wherein the radio frequency coil 136 transmits and does not transmit a signal, respectively. The circuit 152 also includes an amplification circuit system configured to generate radio frequency pulses. Similarly, the receiving coil 138 is connected to a switch 154 that is capable of switching the receiving coil 138 between a receiving mode and a non-receiving mode. Thus, in the receiving mode, the receiving coils 138 resonate with radio frequency signals generated by the release of gyromagnetic nuclei in the patient 126, and in the non-receiving mode, they do not resonate with radio frequency energy from the transmitting coil (i.e., coil 136) to prevent undesired operation. In addition, the receiving circuit 156 is configured to receive data detected by the receiving coil 138, and may include one or more multiplexing and / or amplification circuits.

[0039] It should be noted that although the scanner 102 and control / amplification circuit system described above are illustrated as being connected by a single line, in actual examples there may be many such lines. For example, separate lines may be used for control, data communication, power transmission, etc. In addition, appropriate hardware may be provided along each type of line for properly processing data and current / voltage. In practice, various filters, digitizers, and processors may be provided between the scanner and either or both of the scanner control circuit 104 and the system control circuit system 106.

[0040] As illustrated, the scanner control circuit system 104 includes an interface circuit 158 ​​that outputs signals for driving the gradient field coils and the radio frequency coils and for receiving data representing magnetic resonance signals generated in the examination sequence. The interface circuit 158 ​​is coupled to a control and analysis circuit 160. Based on a defined scheme selected via the system control circuit 106, the control and analysis circuit 160 executes commands for driving the circuits 150 and 152.

[0041] The control and analysis circuitry 160 is also used to receive magnetic resonance signals and perform subsequent processing before transmitting the data to the system control circuitry 106. The scanner control circuitry 104 also includes one or more memory circuits 162 that store configuration parameters, pulse sequence descriptions, examination results, etc. during operation.

[0042] Interface circuit 164 is coupled to control and analysis circuit 160 for exchanging data between scanner control circuit system 104 and system control circuit system 106. In some embodiments, control and analysis circuit 160, although illustrated as a single unit, may include one or more hardware devices. System control circuit 106 includes interface circuit 166 that receives data from scanner control circuit system 104 and transmits data and commands back to scanner control circuit system 104. Control and analysis circuit 168 may include a CPU in a general or special purpose computer or workstation. Control and analysis circuit 168 is coupled to memory circuit 170 to store programming code for operating magnetic resonance imaging system 100, and to store processed image data for later reconstruction, display and transmission. The programming code may execute one or more algorithms that are configured to perform reconstruction of acquisition data as described below when executed by a processor. In some embodiments, memory circuit 170 may store one or more neural networks for reconstruction of acquisition data as described below. In some embodiments, image reconstruction may occur on a separate computing device having a processing circuit system and a memory circuit system.

[0043] Additional interface circuitry 172 may be provided for exchanging image data, configuration parameters, etc. with external system components such as remote access and storage device 108. Finally, system control and analysis circuitry 168 is communicatively coupled to various peripheral devices for facilitating operator interface and producing hard copies of reconstructed images. In the illustrated embodiment, these peripheral devices include a printer 174, a monitor 176, and a user interface 178, which includes devices such as a keyboard, a mouse, a touch screen (e.g., integral to monitor 176), and the like.

[0044] Figure 2 1 is a schematic diagram of a radio frequency coil assembly 180 (eg, a radio frequency receive coil assembly) to be used with an adaptive compression system or an integrated positioning system. The radio frequency coil assembly 180 may be used in a magnetic resonance imaging system (eg, Figure 1 100 in the magnetic resonance imaging system 100). The radio frequency coil assembly 180 includes a radio frequency coil 184 having a plurality of loops 186 (e.g., elements or channels). Each loop 186 is coupled to an electronics unit that is coupled to a coil interface cable. The coil interface cable of each of the loops 186 is coupled to an electrical connector interface or interface circuitry 188 (e.g., a balun such as an integrated balun cable harness that may act as a radio frequency trap). The electrical connector interface 188 is coupled (via cable 190) to a P connector 192 (e.g., a port connector) that enables the radio frequency coil assembly 180 to be coupled (e.g., via a wired connection) to an interface of the magnetic resonance imaging system that couples the imaging component to the processing component. In some embodiments, the radio frequency coil assembly 180 may not have a wired connection and may be configured to be utilized wirelessly with the magnetic resonance imaging system during a magnetic resonance imaging scan (e.g., for coupling the imaging component to the wireless component).

[0045] Each loop 186 may be composed of linked resonator elements coupled to a printed circuit board module (e.g., an electronics unit). Each electronics unit may include various components (e.g., a decoupling circuit, an impedance inverter circuit, and a preamplifier). The RF coil 184 may utilize an AIR® from General Electric Healthcare. TM The RF coil 184 is designed with 3D printed circuit board (3D printing) coil technology. This allows the RF coil 184 to be lightweight and flexible. Each ring 186 includes a ductile (e.g., flexible) conductor that can achieve complex and irregular surface contours. In some embodiments, each ring 186 is stretchable (e.g., due to a liquid metal conductor). Alternatively, each ring 186 may include braided wire, regularly twisted wire, or a spiral wire woven on an extendable non-conductive support or a meandering trace. In addition, the rings 186 of the RF coil 184 are transparent, thereby facilitating the signal-to-noise ratio.

[0046] The radio frequency coil 184 is disposed in a flexible housing 194 (e.g., a blanket). As depicted, the flexible housing 194 has a rectangular shape. In certain embodiments, the flexible housing 194 may have a square shape or other shapes. In certain embodiments, the flexible housing 194 includes holes or openings to increase the flexibility of the radio frequency coil assembly 180 (and the flexible housing 194). Each hole or opening may be radially located within the ring 186. In certain embodiments, the flexible housing 194 may contain a deformable material therein. The deformable material may include foam, memory foam, expansion foam, expansion foam, polyurethane foam, gel such as hydrogel, water ball or other suitable deformable material. When the subject lies on the radio frequency coil assembly 180, the subject will sink into the deformable material, and the radio frequency coil 84 may conform to the unique shape of the subject, and thus just rest against the patient's body. As depicted, the interface circuit system 188 is disposed in the flexible housing 194. In certain embodiments, the interface circuit system 188 may be disposed outside the flexible housing 194.

[0047] Each loop 184 includes a distributed capacitance configuration. Specifically, each loop 184 includes a coaxial conductor having a cross-section configured to generate a precise capacitance for loop tuning at a specific frequency. For example, Figure 3 As depicted, the coaxial coil ring portion 198 (of the ring 184) includes a circular center conductor 200, an outer concentric shield 202, and a dielectric material 204 therebetween. The center conductor 200 may be copper (e.g., silver-plated copper), and the dielectric material 204 may be rubber, plastic, or some other dielectric material (e.g., fluoroethylene propylene (FEP) or polytetrafluoroethylene (pTFE)). The outer concentric shield 202 may encapsulate or otherwise surround the dielectric material 204 and the center conductor 200, and may be comprised of braided copper or other suitable conductive material. The center conductor 200, the dielectric material 204, and the outer shield 202 all share a common central axis 206. Additionally, although in Figure 3 Although not shown, in some examples, an outer jacket (eg, made of a dielectric material) may surround the outer shield 202. Figure 3 200 and outer shield 202, but the RF coil ring portion may include three or more coaxial conductors encapsulated by a dielectric material and spaced apart from each other. In some embodiments, the center conductor 200 may be made of a liquid metal conductor to enable the ring 184 to be stretched.

[0048] Figure 4 The body coil 210 (eg, an integrated compression system) or an integrated positioning system 212 is a body coil 210 (eg, an integrated compression system) having an adaptive compression system (eg, an integrated compression system) or an integrated positioning system 212 Figure 2Schematic diagram of the radio frequency coil assembly 180 in FIG. As depicted, the body coil 210 includes an RF coil 184 disposed within a flexible housing 194. The RF coil 184 includes a plurality of flexible loops having a ductile conductor. The RF coil 184 may utilize an AIR® from GE Medical. TM The body coil 210 may be specifically configured for use with different parts of the anatomy (e.g., head, breast, limbs, etc.). The adaptive compression system 212 is configured to enable positioning of the body coil (and the flexible housing 194) around the curved surface of different parts of the anatomy of the subject to be imaged.

[0049] The adaptive compression system 212 includes an elastic tension element 214, a tension adjustment mechanism 216, and a flexible retaining element 218. A portion of the elastic tension element 214 is disposed within the flexible shell 194. Another portion of the elastic tension element 214 is disposed outside the flexible shell 194. The elastic tension element 214 may include one or more straps or cords. The elastic tension element 214 may include one or more elastic cords, one or more elastic bands, or twine. The number of elastic cords or bands and the arrangement of the elastic or bands may vary depending on the application (e.g., head application, breast application, limb application, etc.). For example, when the body coil 210 is configured for use with the head, a single cord or band may be used. When the body coil 210 is configured for use with the chest or back, multiple cords or bands may be used. The elastic tension element 214 is made of a magnetic resonance imaging compatible material. The elastic tension element 214 is configured to be removed and replaced.

[0050] The flexible retaining element 218 is separated from the flexible shell 194. Although the body coil 210 (and the flexible shell 194) are configured to be disposed on a first side of a portion of the subject to be imaged, the flexible retaining element 218 is configured to be disposed on a second side (e.g., opposite to the first side) of the portion of the subject to be imaged. For example, when imaging the chest region, the body coil 210 (and the flexible shell 294) may be disposed on the chest region, and the flexible retaining element 218 may be disposed on the back region. In this scenario, the placement of the body coil 210 and the flexible retaining element 218 may be reversed. In another example, the body coil 210 (and the flexible shell 194) may be disposed in front of the head, and the flexible retaining element 218 may be disposed behind the head. In some embodiments, the flexible retaining element 218 may be a single piece. In some embodiments, the flexible retaining element 218 may be multiple pieces. In some embodiments, the flexible retaining element 218 may be a flat flexible piece. The shape of the flexible retaining element 218 may vary. The flexible retaining element 218 is made of a magnetic resonance imaging compatible material. In certain embodiments, the flexible retaining element 218 may be made of a polymer compound (eg, polyurethane, polycarbonate, etc.). The flexible retaining element 218 is configured to be removed and replaced.

[0051] The tension adjustment mechanism 216 is coupled to the elastic tension element 214 outside the flexible housing 194. The tension adjustment mechanism 216 is configured to adjust the tension of the elastic tension element 214 to adjust the tightness with which the body coil 210 (and the flexible housing 194) is set around the portion of the subject to be imaged. The tension adjustment mechanism 216 is configured to pull the body coil 210 (and the flexible housing 194) and the flexible retention element 218 closer together around the portion of the subject to be imaged via the flexible retention element 218. The tension adjustment mechanism 216 is made of a magnetic resonance imaging compatible material. In some embodiments, multiple tension adjustment mechanisms 216 may be coupled to multiple straps or cords of the flexible retention element 218. In some embodiments, multiple tension adjustment mechanisms 216 may be coupled to a single strap or cord of the flexible retention element 218. The tension adjustment mechanism 216 is configured to be removed and replaced.

[0052] A variety of different mechanisms can be used for the tension adjustment mechanism 216. In some embodiments, the tension adjustment mechanism 216 includes a turntable coupled to a reel. The turntable is configured to rotate to wind the elastic tension element 214 onto the reel to tighten the body coil 210 (and the flexible housing 194) around the portion of the subject to be imaged. In some embodiments, the tension adjustment mechanism 216 includes a cord lock stop. For example, the cord lock stop may include a round plastic toggle stop, a plastic cord stop, a plastic two-hole snap-lock spring-loaded toggle stop, a metal cord lock spring-loaded stop toggle fastener, a metal spring-loaded snap stop, or a metal spring-loaded cord lock stop toggle fastener.

[0053] In some embodiments, the flexible housing 194 has a first end and a second end. In some embodiments, the elastic tension element 214 may include a first belt or cord disposed closer to the first end of the flexible housing 194 (located within the flexible housing 194) and a second belt or cord disposed closer to the second end of the flexible housing 194 (located within the flexible housing 194). The first belt / cord or the second belt / cord may be adjusted via a tension adjustment mechanism 216 to constrain the body coil 210 to be closer to the portion of the subject to be imaged by tightening the body coil 210 around the body. This enables the body coil 210 to be adjusted around different body types and shapes.

[0054] In certain embodiments, the adaptive compression system 212 is configured for use with pediatric patients because it is easy to fit around the body. Specifically, the adaptive compression system 212 can be used to wrap a newborn or child, thereby reducing the large number of straps and restraints that may be emotionally taxing to parents.

[0055] In certain embodiments, the adaptive compression system 212 can be used with a breast. In certain embodiments, the elastic tension element 214 includes a first mesh rope area located within the flexible shell 194 and a second mesh rope area located within the flexible shell 194. Each mesh rope area is configured to be arranged (and a portion of the body coil 210) around a corresponding breast in the breast. For patients of different sizes and cup sizes, the adaptive compression system 212 can enable the body coil 210 to be pulled closer to the body. The adaptive compression system 212 can be implemented to keep a larger chest size more centered when positioned supine, or to keep the flexible body coil 210 in place when used in a ventral position. The adaptive compression system 212 can be used to treat subjects who have undergone a mastectomy.

[0056] The adaptive compression system 212 can be used for other parts of the body. For example, the adaptive compression system 212 can be used for hip or shoulder holding. Specifically, the body coil 210 is pulled closer around the curved surface.

[0057] Figure 5 Is has Figure 4 Schematic diagram of a body coil 210 of an adaptive compression system or an integrated positioning system 212 in FIG. Figure 6 yes Figure 5 Schematic diagram of a portion of an adaptive compression system or integrated positioning system 212 in the flexible shell 194. The body coil 210 (and the flexible shell 194) includes a first end 220 and a second end 221 (e.g., opposite the first end 220). As depicted, the elastic tension element 214 includes a first rope or belt 222 and a second rope or belt 224. As depicted, the body coil 210 includes a portion of the elastic tension element 214 (both the first rope or belt 222 and the second or belt 224) disposed within the flexible shell 194. Specifically, the elastic tension element 214 includes a first rope or belt 222 and a second belt or second rope, the first rope or belt being disposed closer to the first end 220 of the flexible shell 194 (located within the flexible shell 194), and the second belt or second rope being disposed closer to the second end 222 of the flexible shell 194 (located within the flexible shell 194).

[0058] The elastic tension element 214 is coupled to the flexible retaining element 218. Specifically, the respective ends 226 of the first rope or belt 222 extend through the respective openings 228 on the opposite sides 230, 232 of the flexible retaining element 218, which are adjacent to the side 234. The respective ends 235 of the second rope or belt 224 extend through the respective openings 236 on the opposite sides 230, 232 of the flexible retaining element 218, which are adjacent to the side 238. As depicted, the flexible retaining element 218 is a single flat flexible piece that is configured to bend around a curved surface of a part of the body. The flexible retaining element 218 has a first surface 240 facing the body coil 210 and a second surface 241 opposite to the first surface 240. The first tension adjustment mechanism 242 is coupled to both the end 226 of the first rope or belt 222 and the end 235 of the second rope or belt 224 across the second surface 241. The second tension adjustment mechanism 244 is coupled to the opposite end 226 of the first rope or belt 222 and the opposite end 235 of the second rope or belt 224 across the second surface 241. As depicted, the first tension adjustment mechanism 242 and the second tension adjustment mechanism 244 are both rope lock stops. For example, the rope lock stop can be a round plastic toggle stop, a plastic rope stop, a plastic two-hole card lock spring loaded toggle stop, a metal rope lock spring loaded stop toggle fastener, a metal spring loaded card stop, or a metal spring loaded rope lock stop toggle fastener. In some embodiments, different mechanisms can be used for the first tension adjustment mechanism 244 and the second tension adjustment mechanism 246.

[0059] The first cord or belt 222 and / or the second cord or belt 224 can be adjusted via respective tension adjustment mechanisms 242, 244 to constrain the body coil 210 closer to the portion of the subject to be imaged by tightening the body coil 210 around the body. This enables the body coil 210 to be adjusted around different body types and shapes.

[0060] Figure 7 is disposed around a subject 126 (eg, a patient) to be imaged. Figure 5 Schematic diagram of a portion of an adaptive compression system or integrated positioning system 212 in FIG. The body coil 210 (and the flexible shell 194) are configured to be disposed around a first side of the portion of the subject 126 to be imaged. As depicted, the body coil 210 (and the flexible shell 194) are disposed on a chest region of the subject 126. The flexible retaining element 218 is configured to be disposed around a second side of the portion of the subject 126 to be imaged. As depicted, the flexible retaining element 218 is disposed around a back region of the subject. The first rope or belt 222 and / or the second rope or belt 224 can be adjusted via corresponding tension adjustment mechanisms 242, 244 (not shown) to constrain the body coil 210 to be closer to the portion of the subject 126 to be imaged by tightening the body coil 210 around the body.

[0061] In certain embodiments, flexible retention element 24 may include more than one piece. Figure 8 yes Figure 5 Schematic diagram of a portion of an adaptive compression system or integrated positioning system 212 (e.g., having a multi-piece flexible retention element 218). As depicted, the flexible retention element 218 includes a first piece 248 and a second piece 250. Both the first piece 248 and the second piece 250 are flat flexible pieces that are configured to bend around a curved surface of a portion of the body.

[0062] In certain embodiments, different mechanisms may be used for the tension adjustment mechanism 216 . Fig. 9 is a schematic diagram of a portion of a tensioning mechanism 216. As depicted, the tensioning mechanism 212 is coupled to an elastic tensioning element 214. In certain embodiments, the tensioning mechanism 216 includes a turntable 252 coupled to a reel 254. The turntable 252 is configured to rotate (e.g., in a circumferential direction 256) to wind the elastic tensioning element 214 onto the reel 254 to tighten the body coil (and flexible housing) around the portion of the subject to be imaged.

[0063] Fig.10 The device is provided on a chest region (eg, having a breast) of a subject 126 (eg, a patient). Figure 4Schematic diagram of a top view of a body coil 210 of an adaptive compression system or an integrated positioning system 212 (eg, configured for use with a breast). Fig.11 Is has Fig.10 Schematic diagram of a rear view of the body coil 210 of the adaptive compression system or integrated positioning system 212 not disposed on the subject 126. Fig.10 As depicted, the body coil 210 (and the flexible housing 194) is disposed on the chest region (including the breasts) of the subject 126. The body coil 210 (and the flexible housing 194) includes cup regions 258, 260 that are configured to be disposed around the respective breasts of the subject 126. A portion of the elastic tension element 214 is disposed within the flexible housing 194. Specifically, the portion of the elastic tension element 214 disposed within the flexible housing 194 includes a first mesh cord region 262 located in the cup region 258 and a second mesh cord region 264 located in the cup region 260.

[0064] The adaptive compression system 212 includes a first tension adjustment mechanism 266 disposed outside the flexible housing 194 of the body coil 210. A portion of the elastic tension element 214 coupled to both the first mesh cord region 262 and the second mesh cord region 264 extends outside the flexible housing 194 and is coupled to the first tension adjustment mechanism 266. The first tension adjustment mechanism 266 is configured to enable selective adjustment (e.g., different adjustments) of the first mesh cord region 262 and the second mesh cord region relative to tightening or relaxing engagement of the cup regions 258, 260 with the respective breasts. Thus, the adaptive compression system 212 is configured to handle different cup sizes on the same individual or between different individuals.

[0065] A portion of the elastic tension element 214 outside the flexible shell 194 extends around the side of the subject 126 and is connected to the second tension adjustment mechanism 268 along the back of the subject 126. The second tension adjustment mechanism 268 is configured to enable overall tightening or relaxation of the body coil 210 (and the flexible shell 194) on the chest area (and breast) of the subject 126.

[0066] Fig.12 1 is a schematic diagram of a radio frequency (RF) coil assembly 180 to be used with an adaptive compression system or an integrated positioning system (eg, with a flexible housing 194 having an opening). Figure 2 As described. Fig.12As depicted, the flexible housing 194 includes a plurality of holes or openings 270. The plurality of holes or openings 270 are configured to increase the flexibility of the RF coil assembly 180 (and the flexible housing 194). Each hole or opening 270 may be radially located within the ring 186. In certain embodiments, a corresponding hole or opening 270 may be located within each ring 186. In certain embodiments, a corresponding hole or opening 270 may be located only within some of the rings 186. In certain embodiments, the number of holes or openings 270 may vary. In certain embodiments, the shape of the plurality of holes or openings 270 may vary. In certain embodiments, the shape of the plurality of holes or openings 270 may vary on the same RF coil assembly 180. In certain embodiments, the shape of the plurality of holes or openings 270 may vary between different RF coil assemblies 180.

[0067] Technical effects of the disclosed subject matter include: providing an adaptive compression system (e.g., an integrated adaptive compression system) or an integrated positioning system for holding a body coil (e.g., a radio frequency coil assembly or a radio frequency receiving coil) on a subject to be imaged. The adaptive compression system is adjustable so that the body coil can be tightened or loosened as needed, while the rope layout allows for customized contours around a wide range of anatomical regions. Technical effects of the disclosed subject matter also include: providing a more comfortable positioning of the body coil on the body. The ropes can be loosened or repositioned as needed to achieve imaging and patient comfort. The disclosed adaptive compression system can be oriented in different positions. Technical effects of the disclosed subject matter further include: providing a much faster and streamlined construction. Therefore, the setup time is reduced, and the throughput for using a magnetic resonance scanner can be increased. Moreover, the need for using a bulk positioner is eliminated. Technical effects of the disclosed subject matter even further include: because the tightened body coil is placed closer to the body, away from the aperture of the magnetic resonance scanner, patient safety is increased. Therefore, the body coil is less likely to be as hot (e.g., due to field inhomogeneities at the edge of the aperture). This is particularly useful for areas of the anatomy that are already close to the orifice, such as the shoulder and hip. Technical effects of the disclosed subject matter also further include: improved image quality due to a higher signal-to-noise ratio because the loops of the body coil will be closer to the body. Technical effects of the disclosed subject matter still further include: providing a positioning system that is easier to maintain and clean.

[0068] Reference is made to the technology presented and claimed herein and applied to physical and specific examples of a practical nature that clearly improves upon the present state of the art and, therefore, is not abstract, intangible, or purely theoretical. In addition, if any claim appended to the end of this specification contains one or more elements designated as "means for [performing] the function of ..." or "steps for [performing] the function of ...," it is intended that such elements be interpreted in accordance with 35 U.S.C. § 112(f). However, for any claim containing elements designated in any other manner, it is not intended that such elements be interpreted in accordance with 35 U.S.C. § 112(f).

[0069] This written description uses examples to disclose the subject matter, including the best mode, and also to enable those skilled in the art to practice the subject matter, including making and using any devices or systems and performing any included methods. The patentable scope of the subject matter is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insignificant differences from the literal language of the claims.

Claims

1. A radio frequency receiving coil assembly for a magnetic resonance imaging system, the radio frequency receiving coil assembly comprising: Flexible housing; and a radio frequency coil disposed within the flexible housing, wherein the radio frequency coil includes a plurality of flexible loops having a ductile conductor and the flexible housing is configured to be disposed on a first side of a portion of a subject to be imaged; and An adaptive compression system, the adaptive compression system comprising: a flexible retaining element separate from the flexible housing and configured to be disposed on a second side of the portion of the subject to be imaged; at least one strap coupled to both the flexible housing and the flexible retaining element; and A tension adjustment mechanism is coupled to the at least one strap and is configured to adjust the tension of the at least one strap to adjust the tightness with which the flexible housing is disposed about the portion of the subject to be imaged. 2 . The radio frequency receive coil assembly of claim 1 , wherein at least a portion of the at least one strap is disposed within the flexible housing. 3 . The radio frequency receive coil assembly of claim 1 , wherein the tension adjustment mechanism is coupled to the at least one strap external to the flexible housing.

4. The radio frequency receive coil assembly of claim 1, wherein the tension adjustment mechanism is configured to draw the flexible housing and the flexible retaining element closer together around the portion of the subject to be imaged via the at least one strap. 5 . The radio frequency receive coil assembly of claim 1 , wherein the at least one strap comprises a first strap and a second strap, the first strap and the second strap being coupled to both the flexible housing and the flexible retaining element.

6. The radio frequency receiving coil assembly according to claim 5, wherein the flexible housing includes a first end and a second end opposite to the first end, the first strap and the second strap are disposed closer to the first end and the second end, respectively, and the tension adjustment mechanism is coupled to both the first strap and the second strap and is configured to adjust tension of both the first strap and the second strap. 7 . The radio frequency receive coil assembly of claim 1 , wherein the at least one strap is configured to be removed and replaced.

8. The radio frequency receive coil assembly of claim 1, wherein the at least one strap comprises twine, elastic cord, or elastic band.

9. The RF receive coil assembly of claim 1 , wherein the tension adjustment mechanism comprises a turntable coupled to a spool, wherein the turntable is configured to be rotated to wind the at least one strap onto the spool to tighten the flexible housing around the portion of the subject to be imaged.

10. The radio frequency receive coil assembly of claim 1, wherein the tension adjustment mechanism comprises a cord lock stop.

11. The radio frequency receive coil assembly of claim 1, wherein the adaptive compression system is configured to enable positioning of the flexible housing around a curved surface of different locations of the anatomy of the subject to be imaged.

12. A radio frequency receiving coil assembly for a magnetic resonance imaging system, the radio frequency receiving coil assembly comprising: Flexible housing; and a radio frequency coil disposed within the flexible housing, wherein the radio frequency coil includes a plurality of flexible loops having a ductile conductor and the flexible housing is configured to be disposed on a first side of a portion of a subject to be imaged; and An integrated adaptive compression system, the integrated adaptive compression system comprising: a flexible retaining element separate from the flexible housing and configured to be disposed on a second side of the portion of the subject to be imaged; a tether coupled to both the flexible housing and the flexible retaining element, wherein at least a portion of the tether is disposed within the flexible housing; and A tension adjustment mechanism is coupled to the cable and is configured to adjust the tension of the cable to adjust the tightness with which the flexible housing is disposed about the portion of the subject to be imaged.

13. The radio frequency receive coil assembly of claim 12, wherein the portion of the subject to be imaged is a chest having a breast, and wherein the integrated adaptive compression system is configured to enable positioning of the flexible housing around breasts of different sizes.

14. The radio frequency receiving coil assembly of claim 13, wherein the rope comprises a first mesh rope area located within the flexible shell and a second mesh rope area located within the flexible shell, the first mesh rope area and the second mesh rope area being configured to be disposed around corresponding ones of the breasts, respectively.

15. The radio frequency receive coil assembly of claim 12, wherein the tension adjustment mechanism is coupled to the cord outside of the flexible housing.

16. The radio frequency receive coil assembly of claim 12, wherein the tension adjustment mechanism is configured to draw the flexible housing and the flexible retaining element closer together around the portion of the subject to be imaged via the cord.

17. The radio frequency receive coil assembly of claim 12, wherein the cord comprises a first strap and a second strap, the first strap and the second strap being coupled to both the flexible housing and the flexible retaining element.

18. The radio frequency receiving coil assembly of claim 17, wherein the flexible housing comprises a first end and a second end opposite to the first end, the first strap and the second strap are disposed closer to the first end and the second end, respectively, and the tension adjustment mechanism is coupled to both the first strap and the second strap and is configured to adjust tension of both the first strap and the second strap.

19. The radio frequency receive coil assembly of claim 12, wherein the integrated adaptive compression system is configured to enable positioning of the flexible housing around a curved surface of different locations of the subject's anatomy to be imaged.

20. A radio frequency receiving coil assembly for a magnetic resonance imaging system, the radio frequency receiving coil assembly comprising: Flexible housing; and a radio frequency coil disposed within the flexible housing, wherein the radio frequency coil includes a plurality of flexible loops having a ductile conductor and the flexible housing is configured to be disposed on a chest having a breast of a subject to be imaged; and An integrated adaptive compression system, wherein the integrated adaptive compression system is configured to enable positioning of the flexible shell around breasts of different sizes, wherein the integrated adaptive compression system comprises: a flexible retaining element separate from the flexible housing and configured to be disposed on the back of the subject to be imaged; a cord coupled to both the flexible shell and the flexible retention element, wherein the cord includes a first mesh cord area within the flexible shell and a second mesh cord area within the flexible shell, the first mesh cord area and the second mesh cord area being configured to be disposed around respective ones of the breasts, respectively; and A tension adjustment mechanism is coupled to the cable and is configured to adjust the tension of the cable to adjust the tightness with which the flexible housing is disposed about the chest of the subject to be imaged.

Images