MRI Exam-Specific Parameters: MRA Module (Revised 1-10-2020)
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Modified on: Mon, 13 Jan, 2020 at 10:21 AM
In addition to the exam-specific instructions in the following tables, review the following information prior to examination selection and submission. Failure to follow the guidance below may result in failure of the submitted examination.
Failure to meet anatomic coverage and imaging plane specifications may result in failure.
MRA Abdomen for Renal Artery Stenosis or Vasculitis |
Required Sequences | Category A: Pulse Sequence and Image Contrast | Category B: Anatomic Coverage and Imaging Planes | Category C: Spatial Resolution |
3D contrast-enhanced source images or 3D non-contrast MRA renal images | Must have good artery to background contrastMust have minimal to no venous enhancementMust have correct bolus timing if contrast-enhancedInflow-enhanced (SFFP)e.g.Inhance Suite (GE) NATIVE (Siemens), TRANCE or B-TRANCE (Philips), Time-SLIP, Time Space Angiography or TSA (Toshiba), VASC-ASL (Hitachi) sequences may replace gadolinium-enhanced sequences
| Must cover:Origin of celiac arteryOrigin of superior mesenteric artery (SMA)Right and left renal arteries to the branching in the renal hilum with no motion blurring
| Slice thickness ≤ 3.0 mmReconstructed slice interval ≤ 1.5 mmVoxel volume ≤ 6.0 mm3
|
3D reformatted images (Angiographic Images) | Must have good artery to background contrast
| Must display:Origin of celiac arteryOrigin of superior mesenteric artery (SMA)Right and left renal arteries
| N/A |
MRA High Resolution Arch/Carotid Contrast-Enhanced |
If time-resolved MRA (e.g. TRICKS, TWIST) is submitted, only 2 contrast-enhanced series should be submitted, which must include: - Dynamic phases
- Source images only from peak carotid enhancement phase
|
Required Sequences | Category A: Pulse Sequence and Image Contrast | Category B: Anatomic Coverage and Imaging Planes | Category C: Spatial Resolution |
3D contrast-enhanced source images | Must have good artery to background contrastMust have uniform artery signal/ minimal to no intra-voxel phase dispersionMust have minimal to no venous enhancementMust have correct bolus timingInflow-enhanced (SFFP) e.g. Inhance Suite (GE), NATIVE (Siemens), TRANCE or B-TRANCE (Philips), Time-SLIP, Time Space Angiography or TSA (Toshiba), VASC-ASL (Hitachi) sequences may replace gadolinium-enhanced sequences
| Must cover:Aortic archInnominate arteryRight and left common carotid arteryRight and left carotid bifurcationRight and left subclavian arteries 2 cm distal to the vertebral originsRight and left vertebral arteriesBasilar arteryCircle of Willis
| Slice thickness ≤ 2.0 mmReconstructed slice interval ≤ 1.0 mm- Reconstructed slice interval should be 50 % of the acquired slice thickness
Voxel volume ≤ 3.0 mm3
|
Reformatted contrast-enhanced angiographic images | Must have good artery to background contrastMust have uniform artery signalMust have minimal to no venous enhancement
| Must display in multiple views and should be derived from the contrast MRA sequence:Aortic archInnominate arteryRight and left common carotid arteryRight and left carotid bifurcation (each must be displayed in separate MIP reconstructions)Right and left subclavian arteries 2 cm distal to the vertebral originsRight and left vertebral arteriesBasilar arteryCircle of Willis
| N/A |
MRA Carotid Unenhanced |
Required Sequences | Category A: Pulse Sequence and Image Contrast | Category B: Anatomic Coverage and Imaging Planes | Category C: Spatial Resolution |
3D time of flight source images | Must have good artery to background contrastMust have uniform artery signalMust have minimal to no venous signalA Hi-quality non-contrast MRA includes balanced steady state free precession and arterial spin labeling techniques and may replace 3D time of flight; e.g. NATIVE (Siemens), Inhance Suite (GE), TRANCE or B- TRANCE (Philips), Time-SLIP or Time Space Angiography (Toshiba), VASC-ASL (Hitachi)
| Must cover:2 cm of the right & left common carotid arteries3 cm of the right & left internal carotid arteries2 cm of the right & left external carotid arteries
| Slice thickness ≤ 1.6 mmVoxel volume ≤ 1.7 mm3
|
3D time of flight reformatted images (angiographic images) | Must have good artery to background contrastMust have uniform artery signalMust have minimal to no venous signal
| Must display in multiple views:2 cm of the right & left common carotid arteries3 cm of the right & left internal carotid arteries2 cm of the right & left external carotid arteries
Must show adequate segmentation of carotid arteries such that each artery segment is visible in multiple views with no overlap from other vesselsThe right & left carotid should be segmented separately
| N/A
|
2D time of flight multi-slab source images | Must have good artery to background contrastMust have uniform artery signalMust have minimal to no venous signal
| Must cover:4 cm of the right & left common carotid arteriesright & left internal carotid arteries to the petrous boneright & left external carotid arteriesright & left vertebral arteries
| Slice thickness ≤ 2.0 mmGap ≤ 0 mmPixel area ≤ 1.1 mm2
|
2D time of flight reformatted images (angiographic images) | Must have good artery to background contrastMust have uniform artery signalMust have minimal to no venous signal
| Must display in multiple views:4 cm of the right & left common carotid arteriesright & left internal carotid arteries to the petrous boneright & left external carotid arteriesright & left vertebral arteries
Must show adequate segmentation of carotid arteries such that each artery segment is visible in multiple views with no overlap from other vesselsThe right & left carotid should be segmented separately
| N/A
|
MRA Thoracic Aorta |
Required Sequences | Category A: Pulse Sequence and Image Contrast | Category B: Anatomic Coverage and Imaging Planes | Category C: Spatial Resolution |
Non-contrast black or bright blood source images | Must have good artery to background contrastMust have uniform artery signalMust have minimal to no venous signal
| Must cover:2 cm of the origins of the arch vesselsEntire thoracic aorta from the aortic annulus to the diaphragmatic hiatus
| Slice thickness ≤ 7.0 mmGap ≤ 1.5 mmPixel area ≤ 3.0 mm2
|
3D contrast enhanced source images | Must have good artery to background contrastMust have uniform artery signalMust have minimal to no venous enhancementMust have correct bolus timing
| Must cover:2 cm of the origins of the arch vesselsEntire thoracic aorta from the aortic annulus to the diaphragmatic hiatus
| Slice thickness ≤ 3.4 mmReconstructed slice interval ≤ 1.7 mmVoxel volume ≤ 20.0 mm3
|
3D contrast enhanced reformatted images (angiographic images) | Must have good artery to background contrastMust have uniform artery signalMust have minimal to no venous enhancement
| Must display in multiple views:2 cm of the origins of the arch vesselsEntire thoracic aorta from the aortic annulus to the diaphragmatic hiatus
| N/A |
Revision History for this Article |
Date | Section | Description of Revision(s) |
12-12-19 | All | Article created; FAQs incorporated; No criteria changes |
12-19-19 | MRA Abdomen for Renal Artery Stenosis or Vasculitis | Removed "Contrast Enhanced" from 3D reformatted images (Angiographic Images) sequence description. |
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