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Effect of thin-section diffusion-weighted MR imaging on stroke diagnosis.
Hisao Nakamura1, Kei Yamada, Osamu Kizu
1Department of Radiology, Kyoto Prefectural University of Medicine, Kajii-cyo, Kawaramachi Hirokoji Noboru, Kamigyo-ku, Kyoto City, Japan.
AJNR. American Journal of Neuroradiology
|March 12, 2005
Summary
Thin-section diffusion-weighted imaging significantly improves the detection of small infarcts and enhances stroke diagnosis accuracy. This advanced technique offers better lesion conspicuity for improved patient outcomes.
Area of Science:
- Neuroradiology
- Medical Imaging
Background:
- Diffusion-weighted (DW) imaging, crucial for diagnosing acute cerebral ischemia, faces limitations in spatial resolution, particularly in the z-direction.
- Conventional DW imaging uses a 5-mm section thickness with a 1-mm intersection gap, potentially hindering the visualization of small infarcts.
Purpose of the Study:
- To evaluate if decreasing DW imaging section thickness to 3 mm improves the depiction of small infarcts.
- To determine the impact of thin-section DW imaging on the accuracy of stroke diagnosis.
Main Methods:
- A comparative study involving 49 patients with acute cerebral ischemia symptoms, analyzing both conventional (5-mm) and thin-section (3-mm) DW imaging data.
- Two radiologists independently diagnosed stroke subtypes using the Trial of Org 10172 in Acute Stroke Treatment (TOAST) method, blinded to clinical information.
- Quantitative analysis of lesion conspicuity using contrast-to-noise ratios (CNRs), calculating the relative CNR (rCNR) between thin-section and conventional imaging.
Main Results:
- Stroke diagnosis accuracy improved significantly with thin-section DW imaging: from 78% to 100% for an experienced neuroradiologist and from 71% to 94% for a radiology resident.
- Lesion conspicuity was markedly enhanced on thin-section DW imaging, with an average rCNR of 1.47 ± 0.63.
- A notable improvement in conspicuity was observed for supratentorial lesions (rCNR = 1.51 ± 0.63).
Conclusions:
- Thin-section DW imaging (3 mm) offers superior lesion conspicuity compared to conventional 5-mm thick slices.
- This technique leads to more precise and accurate stroke diagnosis, particularly for subtle infarcts.