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1.5T Non-CE Subtraction MRA - Hyogo Brain and Heart Center

ExamCard
Ishii, Kazunari Hyogo Brain and Heart Center
Takeshi, Ishimoto Hyogo Brain and Heart Center
Okuaki, Tomoyuki Philips Healthcare

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ExamCard purpose

The non-contrast subtraction MRA technique uses the signal difference between systole and diastole in arteries. Subtraction of the diastolic bright-blood arteries from the systolic black-blood arteries allows visualization of the arteries, while the veins are cancelled out, as they are depicted as bright-blood throughout the cardiac cycle. The sequence that is used in this ExamCard is a conventional Turbo SE with ECG triggering. This technique is not dependent on inflow, therefore it is possible to plan your slices parallel to the main orientation of the vessels. The peripheral vasculature for instance, can thus be imaged in a coronal plane, which limites the amount of slices necessary to cover the anatomy, and thus limits the total scantime.
Figure 1. Principle of non-contrast subtraction MRA. During systole the signal intensity in the arteries is low, due to the occurrence of flow voids. The signal in the veins is stable throughout the cardiac cycle. <br>
Figure 1.
Principle of non-contrast subtraction MRA. During systole the signal intensity in the arteries is low, due to the occurrence of flow voids. The signal in the veins is stable throughout the cardiac cycle.
Figure 2. The subtraction of the systolic image (middle) from the diastolic image (left) results in the arterial image (right). <br><br>
Figure 2.
The subtraction of the systolic image (middle) from the diastolic image (left) results in the arterial image (right).

Figure 3. Influence of different choices for the systolic trigger delay. The acquisition must be timed such that systolic flow is maximal.
Figure 3.
Influence of different choices for the systolic trigger delay. The acquisition must be timed such that systolic flow is maximal.

ExamCard overview

Non-contrast Subtraction Angiography

ExamCard images - Scan setup

Survey Position of the Qflow scan is indicated.Q-Flow The systolic image needs to be acquired during the period in which the flow is fastest.
Survey
Q-Flow
Position of the Qflow scan is indicated.
The systolic image needs to be acquired during the period in which the flow is fastest.

Example 1 - Femoral arteries

Non-contrast Subtraction MRA 3D-CTA
Non-contrast Subtraction MRA
3D-CTA

Example 2 - Aorto-iliac bifurcation

Non-contrast Subtraction MRA X-ray 3D-CTA
Non-contrast Subtraction MRA
X-ray
3D-CTA

Example 3 - Subclavian arteries

Non-contrast Subtraction MRA
Non-contrast Subtraction MRA


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Apr 12, 2007

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ExamCard
Achieva 1.5T
Release 2
Abdominal MRA, Brain, Carotid, Extracranial MRA, Peripheral MRA, Thoracic MRA, Total Body MRA, TRANCE, Vascular
 

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