Diffusion-weighted MR imaging of abdominopelvic abscesses
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Aytekin Oto & Christine Schmid-Tannwald & Garima Agrawal & Arda Kayhan & Hatice Lakadamyali & Sarah Orrin & Ila Sethi & Steffen Sammet & Xiaobing Fan
- چاپ و سال / کشور: 2011
Description
This study was conducted to determine the incremental value of diffusion-weighted MR imaging (DW-MRI) over T2-weighted imaging diagnosing abdominopelvic abscesses and compare apparent diffusion coefficient (ADC) values of abscesses and non-infected ascites. In this IRB-approved, HIPAA-compliant study, two radiologists retrospectively compared T2-weighted, T2-weighted+ DW-MRI and T2-weighted+contrast enhanced MR images of 58 patients (29 with abscess, 29 with ascites) who underwent abdominal MRI for abscess detection. Confidence and sensitivity was compared using McNemar’s test. ADC of abscesses and ascites was compared by t test, and a receiver operating characteristic (ROC) curve was constructed. Detection of abscesses and confidence improved significantly when T2-weighted images were combined with DW-MRI (sensitivity: observer 1—100%, observer 2—96.6%) or contrast enhanced images (sensitivity: both observers— 100%) compared to T2-weighted images alone (sensitivity: observer 1—65.5%, observer 2—72.4%). All abscesses showed restricted diffusion. Mean ADC of abscesses (observer 1—1.17±0.42×10-³mm²/s, observer 2—1.43±0.48× 10-3 mm²/s) was lower than ascites (observer 1—3.57± 0.68×10-3 mm²/s, observer 2—3.42±0.67×10-3 mm²/s) (p< 0.01). ROC analysis showed perfect discrimination of
Emerg Radiol DOI 10.1007/s10140-011-0976-1 Received: 1 May 2011 / Accepted: 28 July 2011
