3D UTE Cones MRI for Cortical and Trabecular Bone Imaging
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Solution Overview
Problem
Current methods for evaluating osteoporosis, such as DEXA, are limited as they only assess bone mineral density, failing to provide comprehensive information on bone quality and fracture risk due to their inability to measure organic matrix and water content, which are crucial for understanding bone strength.
Innovation Solution
The implementation of 3D adiabatic inversion recovery prepared UTE Cones sequences for imaging cortical and trabecular bone, using adiabatic inversion recovery pulses and soft-hard composite pulses to suppress unwanted signals, allowing for the acquisition of detailed images of total water, bound water, and collagen proton density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If DEXA is used to assess bone mineral density, then the measurement is simple and widely available, but it only measures bone mineral and cannot provide information on organic matrix and water content
Solution Approach 1:
The patent segments the bone tissue into distinct components (cortical bone, trabecular bone, organic matrix, water, mineral) and develops specific MRI pulse sequences to image each component separately. This allows comprehensive bone quality assessment by measuring multiple parameters (T1, T2*, bound water content) rather than just bone mineral density, resolving the information loss limitation of DEXA while maintaining clinical feasibility
Solution Approach 2:
The patent changes the measurement parameters from single-parameter BMD measurement to multi-parameter imaging including T1 relaxation time, T2* relaxation time, and bound water content. These parameter changes enable comprehensive assessment of bone quality, organic matrix, and water content, overcoming the information limitations of conventional DEXA while providing clinically actionable data
2Measurement precision
If conventional MRI sequences are used for bone imaging, then the equipment is widely available, but the signal from cortical and trabecular bone is too short to be detected
Solution Approach 1:
The patent applies preliminary action by using adiabatic inversion recovery pulses before the main imaging sequence to suppress unwanted signals from tissues with longer T2 relaxation times. This preparatory step enhances the detectability of the short-lived bone signal by reducing background interference, allowing precise measurement of cortical and trabecular bone signals that would otherwise be undetectable
Solution Approach 2:
The patent implements ultrashort echo time (UTE) imaging that rushes through the detection window before the bone signal decays. By acquiring the signal extremely quickly (ultrashort echo time) after the radiofrequency pulse, the system captures the brief bone signal before it disappears, resolving the detection limitation imposed by the short signal duration
3Reliability
If adiabatic inversion recovery pulses with multiple spokes are used, then unwanted signals are suppressed and bone imaging is enhanced, but the sequence complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism (adiabatic inversion recovery pulses with specific TR/TI combinations) that mediates between the excitation pulse and the imaging sequence. This intermediary suppresses unwanted signals from tissues with longer T2 relaxation times while preserving the bone signal, achieving reliable signal suppression without requiring fundamental changes to the MRI system architecture
Solution Approach 2:
The patent uses periodic action through multiple spokes in the k-space acquisition, where each spoke represents a periodic sampling of the signal at different angles. This periodic sampling with multiple spokes enhances signal suppression accuracy and image quality while maintaining reasonable sequence complexity through efficient k-space traversal patterns
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides high-contrast, volumetric imaging of cortical and trabecular bone, offering a more accurate assessment of bone quality and fracture risk by quantifying T1 and T2* relaxation times and bound water content, thereby overcoming the limitations of existing technologies.
Implementation Method 1
applying one or more adiabatic inversion recovery pulses to the cortical and trabecular bone, wherein the one or more adiabatic inversion recovery pulses are provided with multiple spokes in a three dimensional adiabatic ultrashort TE cones sequence
Implementation Method 2
rotating a magnetization of a tissue in the cortical and trabecular bone in a first direction by applying a first pulse with a negative angle to the cortical and trabecular bone; further rotating the magnetization of the tissue in the cortical and trabecular bone in a second, opposite direction to the first direction by applying a second pulse with a positive angle
Implementation Method 3
performing data acquisition, by using the multiple spokes, on a target signal obtained after the applying of the one or more adiabatic inversion recovery pulses
Data Source
AI summary
Devices, systems and methods for imaging cortical and trabecular bone are described. An example method for imaging cortical and trabecular bone is provided to include applying one or more adiabatic inversion recoveiy pulses to a cortical and trabecular bone, wherein the one or more adiabatic inversion recoveiy pulses are provided with multiple spokes in a three dimensional adiabatic ultrashort TE cones sequence (3D UTE-Cones sequence) that has a TR/TI combination, TR and TI corresponding to repetition time and inversion time, respectively; and performing data acquisition, by using the multiple spokes, on a target signal obtained after the applying of the one or more adiabatic inversion recoveiy pulses.