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Dynamic MRI for distinguishing high-flow from low-flow peripheral vascular malformations
Yoshimitsu Ohgiya1, Toshi Hashimoto, Takehiko Gokan
1Department of Radiology, Showa University School of Medicine, Tokyo, Japan. yogiya@qd5.so-net.ne.jp
AJR. American Journal of Roentgenology
|October 26, 2005
Summary
Dynamic MRI effectively differentiates high-flow from low-flow vascular malformations. Measuring contrast rise time is key for accurate diagnosis, potentially avoiding unnecessary angiography for low-flow cases.
Area of Science:
- Radiology
- Medical Imaging
- Vascular Medicine
Background:
- Vascular malformations are classified as high-flow or low-flow.
- Distinguishing between these types is crucial for appropriate treatment planning.
- Low-flow malformations often do not require invasive procedures like angiography.
Purpose of the Study:
- To evaluate the efficacy of dynamic Magnetic Resonance Imaging (MRI) in differentiating high-flow from low-flow peripheral vascular malformations.
- To determine if dynamic MRI can obviate the need for angiography in certain cases.
Main Methods:
- A study involving 16 patients with peripheral vascular malformations (6 high-flow, 10 low-flow) using conventional and dynamic MRI.
- Calculation of "artery-lesion enhancement time" and "contrast rise time" based on temporal enhancement patterns.
- Diagnosis confirmation through conventional angiography or venography.
Main Results:
- High-flow malformations exhibited significantly shorter mean artery-lesion enhancement times (3.3 sec) compared to low-flow malformations (8.8 sec) (p < 0.05).
- Mean maximal lesion enhancement times were also significantly shorter for high-flow malformations (5.8 sec) versus low-flow malformations (88.4 sec) (p < 0.01).
Conclusions:
- Dynamic MRI is a valuable tool for distinguishing between high-flow and low-flow vascular malformations.
- Measurement of contrast rise time using dynamic MRI is particularly useful for this differentiation.