Related Experiment Video
Updated: Sep 25, 2026
Endovascular Perforation Model for Subarachnoid Hemorrhage Combined with Magnetic Resonance Imaging (MRI)
Published on: December 16, 2021
Intracranial artery dissections: serial evaluation with MR imaging, MR angiography, and source images of MR
Toshinori Hirai1, Yukunori Korogi, Yuka Murata
1Department of Radiology, Amakusa Medical Center, Hondo, Kumamoto, Japan.
Background And Purpose:
To assess chronological change in intracranial artery dissections with magnetic resonance imaging (MRI), MR angiography (MRA), and source images of MRA, and to determine whether the source images of MRA provide additional useful information to the combined evaluation of MRI and MRA.
Materials And Methods:
Seven consecutive patients with intracranial artery dissections who were diagnosed by clinical history and conventional angiography were followed sequentially with MRI and MRA (mean follow-up duration, 8.8 months). Two observers independently reviewed the signal intensity of the arterial wall on T1-weighted images, luminal structures on MRA, and source images of MRA.
Results:
In three (43%) of seven patients, the affected arterial wall had high signal intensity area from 4 to 62 days after onset on T-weighted images. Double lumen on MRA wasobserved only in one patient during the course of the study, whereas a definite low-intensity linear area in the lumen on source images of MRA was seen from 0 to 773 days after onset in all patients. When information from the source images of MRA was added to evaluation with both MRI and MRA, detectability increased to 100% from day 0 to day 3 and 67% from day 4 to day 30.
Conclusion:
The signal intensity of the dissected wall and the luminal structures on MRA and its source images vary according to chronological age. The use of source images from MRA in addition to the combined evaluation of MRI and MRA may provide more accurate diagnosis and follow-up study of intracranial artery dissections.
Insights
Source images of MR angiography (MRA) enhance the diagnosis of intracranial artery dissections. This method improves detection rates when combined with MRI and MRA, aiding in accurate follow-up studies.
Area of Science:
- Neuroradiology
- Vascular Imaging
- Neurology
Background:
- Intracranial artery dissections require accurate diagnostic and follow-up imaging.
- Magnetic resonance imaging (MRI) and MR angiography (MRA) are key tools for evaluation.
- The added value of MRA source images needs further assessment.
Purpose of the Study:
- To evaluate chronological changes in intracranial artery dissections using MRI, MRA, and MRA source images.
- To determine if MRA source images offer additional diagnostic information beyond combined MRI and MRA.
Main Methods:
- Seven patients with intracranial artery dissections were followed using MRI and MRA over 8.8 months.
- Observers independently reviewed arterial wall signal intensity, MRA luminal structures, and MRA source images.
- Conventional angiography confirmed initial diagnoses.
Main Results:
- High signal intensity in the dissected arterial wall was observed in 43% of patients within 62 days.
- A double lumen was rarely seen on MRA, but a low-intensity linear area in the lumen was consistently visible on MRA source images.
- Adding MRA source images improved detection rates to 100% in the first 3 days and 67% within the first 30 days.
Conclusions:
- Signal intensity and luminal characteristics on MRI, MRA, and MRA source images change over time.
- Incorporating MRA source images with MRI and MRA enhances diagnostic accuracy and follow-up for intracranial artery dissections.
Related Concept Videos
01:21Aneurysm II: Clinical Manifestations and Diagnostic Studies
01:21Imaging Studies for Cardiovascular System IV: CMRI
01:19Imaging Studies VII: Vascular Imaging