Diagnosis of intracranial hemorrhagic lesions: comparison between 3D-SWAN (3D T2*-weighted imaging with multi-echo acquisition) and 2D-T2*-weighted imaging
| Autor: | Hodaka Ooki, Atsushi Ogasawara, Yukunori Korogi, Yasuhiro Hiai, Joji Nishimura, Keita Watanabe, Shingo Kakeda, Yoshiko Hayashida, Satoshi Ide, Norihiro Ohnari |
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| Rok vydání: | 2014 |
| Předmět: |
Adult
Male medicine.medical_specialty Adolescent Sensitivity and Specificity Cohort Studies Young Adult Imaging Three-Dimensional Humans Medicine Radiology Nuclear Medicine and imaging Child Aged Cerebral Hemorrhage Aged 80 and over Radiological and Ultrasound Technology medicine.diagnostic_test Echo-Planar Imaging business.industry General Medicine Middle Aged Subarachnoid Hemorrhage Mr imaging Cerebral Angiography Angiography Female Radiology business T2 weighted Multi echo |
| Zdroj: | Acta Radiologica. 55:201-207 |
| ISSN: | 1600-0455 0284-1851 |
| Popis: | Background 3D-susceptibility-weighted angiography (SWAN) can produce high-resolution images that yield excellent susceptibility-weighted contrast at a relatively short acquisition time. Purpose To compare SWAN- and 2D-T2*-weighted gradient-echo images (T2*-WI) for their sensitivity in the depiction of cerebral hemorrhagic lesions. Material and Methods We subjected 75 patients with suspected cerebral hemorrhagic lesions to SWAN and T2*-WI at 3T. We first measured the contrast-to-noise ratio (CNR) using an agar phantom that contained different concentrations of superparamagnetic iron oxide (SPIO). The acquisition time for SWAN and T2*-WI was similar (182 vs. 196 s). Neuroradiologists compared the two imaging methods for lesion detectability and conspicuity. Results The CNR of the phantom was higher on SWAN images. Of the 75 patients, 50 were found to have a total of 278 cerebral hemorrhagic lesions (microbleeds, n = 229 [82.4%]; intracerebral hemorrhage, n = 18 [6.5%]; superficial siderosis, n = 13 [4.7%]; axonal injuries, n = 8 [2.9%]; subarachnoid hemorrhage [SAH] or brain contusion, n = 3 each [1.0%]; subdural hematoma, n = 2 [0.7%]; cavernous hemangioma or dural arterteriovenous fistula, n = 1 each [0.4%]). In none of the lesions was the SWAN sequence inferior to T2*-WI with respect to lesion detectability and conspicuity. In fact, SWAN yielded better lesion conspicuity in patients with superficial siderosis and SAH: it detected significantly more lesions than T2*-WI ( P Conclusion SWAN is equal or superior to standard T2*-WI for the diagnosis of various cerebral hemorrhagic lesions. Because its acquisition time is reasonable it may replace T2*-WI. |
| Databáze: | OpenAIRE |
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