Technical Note: Four‐dimensional deformable digital phantom for MRI sequence development
نویسندگان
چکیده
Purpose MR-guided radiotherapy has different requirements for the images than diagnostic radiology, thus requiring development of novel imaging sequences. MRI simulation is an excellent tool optimizing these new sequences; however, currently available software does not provide all necessary features. In this paper, we present a digital framework testing sequences that incorporates anatomical structure, respiratory motion, and realistic presentation MR physics. Methods The extended Cardiac-Torso (XCAT) was used to create T1, T2, proton density maps formed structure phantom. Respiratory motion model based on XCAT deformation vector fields, modified driven by respiration signal. carried out with JEMRIS, open source Bloch simulator. We developed extension which calculates each spin independently, allowing deformable motion. Results performance demonstrated through simulating acquisition two-dimensional (2D) cine demonstrating expected ghosts from T2 weighted echo acquisitions patterns. All simulations were consistent behavior previously described in literature. Simulations more time consuming rigid Conclusions four-dimensional (4D) phantom sequence development. breathing patterns, achieve accurate MRI. This method particularly relevant purpose lungs abdomen.
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ژورنال
عنوان ژورنال: Medical Physics
سال: 2021
ISSN: ['2473-4209', '1522-8541', '0094-2405']
DOI: https://doi.org/10.1002/mp.15036