Breast Micro-Calcification MRI Reconstruction via DIXON and Gradient Echo
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Solution Overview
Problem
Current Magnetic Resonance Imaging (MRI) techniques struggle to accurately detect breast micro-calcifications without using ionizing radiation, as they are prone to artifacts from fat and fibroglandular tissue, which confound the detection of small calcifications.
Innovation Solution
The method employs a combination of gradient echo and DIXON MRI data, processed through a breast micro-calcification image reconstruction module, which includes spatial matching, high-pass filtering, and phase unwrapping to generate a projection image that effectively isolates and visualizes breast micro-calcifications, similar to conventional mammograms, without the need for X-rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional MRI techniques are used to image breast tissue, then soft tissue contrast is improved, but detection precision of micro-calcifications deteriorates due to artifacts from fat and fibroglandular tissue
Solution Approach 1:
The patent segments the breast tissue signal into different components (fat, water, fibroglandular tissue, and calcifications) using multi-echo gradient echo sequences combined with DIXON water-fat separation. This segmentation allows selective suppression of fat and fibroglandular tissue signals while preserving calcification detection, resolving the contradiction between soft tissue contrast and micro-calcification detection precision.
Solution Approach 2:
The patent employs multiple echo times (TE) in the gradient echo sequence to exploit the different T2* relaxation characteristics of various tissue types. By acquiring data at multiple TEs and applying appropriate filtering and reconstruction algorithms, the system changes the temporal parameters of signal acquisition to differentiate between fat, water, and calcifications, thereby improving detection precision while maintaining soft tissue contrast.
2Measurement precision
If mammography is used to detect breast micro-calcifications, then detection precision is improved, but harmful factors increase due to ionizing radiation exposure
Solution Approach 1:
The patent replaces the X-ray based mammography system with an MRI-based detection system that uses magnetic fields and radiofrequency pulses instead of ionizing radiation. By utilizing the magnetic susceptibility differences and T2* relaxation properties of calcifications, the system achieves comparable detection precision without the harmful radiation exposure associated with conventional mammography.
3Reliability
If fat suppression techniques are applied in MRI, then artifact reduction is improved, but signal intensity from fatty tissues deteriorates
Solution Approach 1:
The patent uses dynamic fat suppression through multi-echo acquisition where the degree of fat signal suppression varies across different echo times. By acquiring data at multiple TEs and applying time-dependent filtering and reconstruction, the system dynamically adjusts fat signal levels to minimize artifacts while preserving necessary anatomical information, resolving the contradiction between artifact reduction and fat signal preservation.
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 allows for reliable detection of breast micro-calcifications using non-ionizing radiation, enhancing the sensitivity and accuracy of MRI for breast cancer screening by mitigating the confounding effects of fat and fibroglandular tissue, thereby providing a safer alternative to traditional mammography.
Implementation Method 1
A large static magnetic field is used by Magnetic Resonance Imaging (MRI) scanners to align the nuclear spins of atoms
Implementation Method 2
align the nuclear spins of atoms as part of the procedure for producing images within the body of a patient
Implementation Method 3
In DIXON magnetic resonance imaging, measurements are taken at multiple phases and the image components can be separated into fat image which images the fat or lipid content of voxels and a water image which images non-adipose tissue
Implementation Method 4
The breast micro-calcification magnetic resonance image can be further filtered using a high-pass spatial filter and used to generate a projection image
Data Source
AI summary
Disclosed herein is a method of medical imaging. The method comprises receiving (202) gradient echo magnetic resonance imaging data (123) descriptive of a breast region (319) of a subject (318). The method further comprises receiving (202) DIXON magnetic resonance imaging data descriptive of the breast region. The DIXON magnetic resonance imaging data and the gradient echo magnetic resonance imaging data are spatially matched. The method further comprises generating (204) a breast micro-calcification magnetic resonance image (128) by inputting the gradient echo magnetic resonance imaging data and the DIXON magnetic resonance imaging data into a breast micro-calcification image reconstruction module (122). The breast micro-calcification image reconstruction module is configured to output abreast micro-calcification magnetic resonance image in response to inputting the gradient echo magnetic resonance imaging data and the DIXON magnetic resonance imaging data. The breast micro-calcification magnetic resonance image is descriptive of a location of breast micro-calcifications, wherein the gradient echo magnetic resonance imaging data is a phase image.