title: Susceptibility weighted imaging: a new tool in the diagnosis of prostate cancer and detection of prostatic calcification.
abstract: BACKGROUND
  Susceptibility weighted imaging (SWI) is a new MRI technique which has been proved very useful in the diagnosis of brain diseases, but few study was performed on its value in prostatic diseases. The aim of the present study was to investigate the value of SWI in distinguishing prostate cancer from benign prostatic hyperplasia and detecting prostatic calcification.
  
  
  RESULTS
  23 patients with prostate cancer and 53 patients with benign prostatic hyperplasia proved by prostate biopsy were scanned on a 3.0T MR and a 16-row CT scanner. High-resolution SWI, conventional MRI and CT were performed on all patients. The MRI and CT findings, especially SWI, were analyzed and compared. The analyses revealed that 19 out of 23 patients with prostate cancer presented hemorrhage within tumor area on SWI. However, in 53 patients with benign prostatic hyperplasia, hemorrhage was detected only in 1 patient in prostate by SWI. When comparing SWI, conventional MRI and CT in detecting prostate cancer hemorrhage, out of the 19 patients with prostate cancer who had prostatic hemorrhage detected by SWI, the prostatic hemorrhage was detected in only 7 patients by using conventional MRI, and none was detected by CT. In addition, CT demonstrated calcifications in 22 patients which were all detected by SWI whereas only 3 were detected by conventional MRI. Compared to CT, SWI showed 100% in the diagnostic sensitivity, specificity, accuracy, positive predictive value(PPV) and negative predictive value(NPV) in detecting calcifications in prostate but conventional MRI demonstrated 13.6% in sensitivity, 100% in specificity, 75% in accuracy, 100% in PPV and 74% in NPV.
  
  
  CONCLUSIONS
  More apparent prostate hemorrhages were detected on SWI than on conventional MRI or CT. SWI may provide valuable information for the differential diagnosis between prostate cancer and prostatic hyperplasia. Filtered phase images can identify prostatic calcifications as well as CT.
authors: Department of Radiology, Henan Provincial People's Hospital, Zhengzhou, Henan, China.
authors: Yan
authors: Y
authors: Bai
authors: Mei-Yun
authors: MY
authors: Wang
authors: Yan-Hong
authors: YH
authors: Han
authors: She-Wei
authors: SW
authors: Dou
authors: Qing
authors: Q
authors: Lin
authors: Ying
authors: Y
authors: Guo
authors: Wei
authors: W
authors: Li
authors: De-Gang
authors: DG
authors: Ding
authors: Jian-Ping
authors: JP
authors: Dai
authors: Wei
authors: W
authors: Qin
authors: Da-Peng
authors: DP
authors: Shi
authors: Jie
authors: J
authors: Tian
authors: Yong-Ming
authors: YM
authors: Dai
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011467:Prostate / Q000473:pathology*; D011470:Prostatic Hyperplasia / Q000175:diagnosis* / Q000473:pathology; D011471:Prostatic Neoplasms / Q000175:diagnosis* / Q000473:pathology