dynamic programming computer model 4  (Johns Hopkins HealthCare)

Journal: Magnetic Resonance in Medicine

Article Title: Radial TRASE: 2D RF encoding through mechanical rotation and active digital decoupling

doi: 10.1002/mrm.70104

Figure Lengend Snippet: Depiction of the mechanical rotation system. (A) Image of the connected motor outside the RF shielding. The drive rod connects to the motor and is passed directly through a waveguide to the coils. (B) A Fusion360 model of the coil pair within the magnet. The RF coils ( red and yellow ) rest on the bore tube ( green ), which positions the coils centrally and guides rotation. A three‐dimensional‐printed connection ( gray ) affixes the coils to the drive rod ( blue ) axially and houses their circuit boards.

Article Snippet: Using the computer‐assisted modeling (CAM) program Fusion360 (Autodesk, California, USA), both coils were previously 3D‐printed with the optimized wire pattern modeled directly into their formers.

Techniques:

Journal: Magnetic Resonance in Medicine

Article Title: Radial TRASE: 2D RF encoding through mechanical rotation and active digital decoupling

doi: 10.1002/mrm.70104

Figure Lengend Snippet: Demonstration of sequential slice Radial TRASE imaging. The pulse sequence for each slice consisted of 200‐μs hard pulses, echo train length of 128, echo time of 2000 μs, repetition time of 1000 ms, acquisition window of 1000 μs, four averages, and 201 radial spokes. A uniform B 0 coil within the magnet bore is used to shift the resonance slice due to the static axial gradient. Imaging was performed with a phantom containing nine 8‐mm‐diameter water vials. One vial is positioned centrally, with the remaining eight angled toward the center by 24°. (A) Sequential slice images were obtained for B 0 shift coil currents of −3, −1.5, 0, 1.5, and 3 A. The expected shift between each slice is 10.4 mm with a reconstructed partition thickness of 3.36 mm. From left to right, the ring of vials spreads outward, indicating successful shifting of the resonance slice position by the uniform B 0 coil. (B) Fusion360 model with a different perspective of the imaged vial phantom.

Article Snippet: Using the computer‐assisted modeling (CAM) program Fusion360 (Autodesk, California, USA), both coils were previously 3D‐printed with the optimized wire pattern modeled directly into their formers.

Techniques: Imaging, Sequencing