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Aortic dissection: sensitivity and specificity of MR imaging
B A Kersting-Sommerhoff1, C B Higgins, R D White
1Department of Radiology, University of California School of Medicine, San Francisco 94143.
Abstract:
Gated transverse magnetic resonance (MR) images of 54 patients (35 male, 19 female; aged 16-90 years) with suspected or known aortic dissection were reviewed by three cardiac radiologists without knowledge of clinical details. The reviewers independently determined the presence or absence and the type of aortic dissection. A confidence level was assigned for each diagnosis, and receiver operating characteristic curves were generated. The reviewer with extensive MR experience correctly identified 96% of the proved aortic dissections and all of the normal cases; the reviewer with moderate experience identified 96% and 84%, respectively; and the reviewer with minimal experience, 78% and 94%. The sensitivity at a specificity level of 90% was determined for each reviewer (100%, 96%, and 83%, respectively). MR imaging is highly sensitive and specific in the diagnosis of aortic dissection but does require considerable experience because of the need to recognize flow artifacts.
Insights
Gated magnetic resonance (MR) imaging is a highly sensitive and specific tool for diagnosing aortic dissection. However, accurate interpretation requires significant radiologist experience to differentiate true findings from flow artifacts.
Area of Science:
- Radiology
- Cardiovascular Imaging
- Diagnostic Medicine
Background:
- Aortic dissection is a life-threatening condition requiring accurate and timely diagnosis.
- Magnetic resonance (MR) imaging is a key modality for evaluating the aorta.
- Assessing the diagnostic performance of gated transverse MR imaging for aortic dissection is crucial.
Purpose of the Study:
- To evaluate the diagnostic accuracy of gated transverse MR imaging in detecting aortic dissection.
- To determine the sensitivity and specificity of MR imaging for aortic dissection across different levels of radiologist experience.
Main Methods:
- Retrospective review of gated transverse MR images from 54 patients with suspected or confirmed aortic dissection.
- Independent image interpretation by three cardiac radiologists with varying levels of MR experience.
- Analysis of diagnostic performance using receiver operating characteristic (ROC) curves and calculation of sensitivity and specificity.
Main Results:
- Experienced radiologists achieved high accuracy, with the most experienced reviewer correctly identifying 96% of dissections and 100% of normal cases.
- Sensitivity at 90% specificity ranged from 100% for the expert reviewer to 83% for the least experienced.
- Accurate diagnosis is dependent on the ability to interpret flow artifacts, which can mimic or obscure dissection.
Conclusions:
- Gated transverse MR imaging is a highly sensitive and specific method for diagnosing aortic dissection.
- Radiologist experience significantly impacts diagnostic performance, highlighting the need for specialized training.
- Familiarity with MR flow artifacts is essential for reliable interpretation in aortic dissection evaluation.