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Table 4 MRI protocol

From: MR-PROTECT: Clinical feasibility of a prostate MRI-only radiotherapy treatment workflow and investigation of acceptance criteria

  T2 Propeller (Tra, Cor and Sag) Large FOV T2 MEGRE
Sequence order in protocol Tra 1, Cor 4 and Sag 5 2 3
Primary field of application Target definition support sCT-generation
GFM-definition
Target definition
Risk organ definition
GFM-identification
Scan sequence 2D - Periodically Rotated Overlapping Parallel Lines with Enhanced Reconstruction 2D Fast Recovery Fast Spin Echo 2D Multi-Echo Fast Gradient Echo
Slice orientation Tra, Cor, Sag Tra Tra
Frequence encoding direction Right-Left Anterior-Posterior
Field of view (frequency encoding direction) (cm) 22 44.8 24
Field of view (phase encoding direction) (cm) 22 31.4 24
Matrix size (frequency encoding direction) 352 640 164
Matrix size (phase encoding direction) 352 512 164
Scan pixel size (frequency encoding direction) (mm) 0.63 0.7 1.46
Scan pixel size (phase encoding direction) (mm) 0.63 0.61 1.46
Reconstructed pixel size (frequency encoding direction) (mm) 0.43 0.44 0.47
Reconstructed pixel size (phase encoding direction) (mm) 0.43 0.44 0.47
Bandwidth per pixel (Hz) 473 390 508
Acqusition time 04:43, 04:17, 03:19 07:00 05:36
Slice thickness (mm) 2.8, 3, 3 2.5 2.8
Slice gap (mm) 0 0 0
Repetition time (ms) 9151, 8293, 7381 15,000 1000
Number of slices 32, 29, 23 88 34
Echo time (ms) 96, 96, 109 96 2.38–23.6
Inter-echo time 3.03 ms
Refocusing flip angle (deg) 120 130
Echo train length 28, 28, 32 15
Number of averages 2.10, 2, 2 1 2
Number of echoes 1 1 8
Intensity correction Yes (SCIC) Yes (SCIC) Yes (SCIC)
Intensity filter None None
3D geometry correction Not available Yes Yes
Shimming Yes (Auto) Yes (Auto) Yes (Auto)
Flow compensation direction Slice direction
RF transmit mode Multi transmit Multi transmit Multi transmit