title: Direct MRI-guided biopsy of the prostate: use of post-biopsy needle track imaging to confirm targeting.
abstract: OBJECTIVE
  To report the observation that in-plane post-biopsy T2-weighted MRI often demonstrates the needle track as a transient visible linear tissue distortion during direct MRI-guided biopsy.
  
  
  METHODS
  We retrospectively identified 11 prostatic lesions in 9 men that underwent direct MRI-guided biopsy and in which post-biopsy images were obtained in the plane of the biopsy needle.
  
  
  RESULTS
  In 9 of 11 targets, a post-biopsy needle track was visible as a linear tissue distortion on in-plane T2-weighted images obtained at a mean interval of 6 min (range 3-15). In these nine cases, the needle track traversed the intended target, and the biopsy was positive for malignancy in six. Biopsy was positive in one of two cases where the needle track was not visible. In five targets, one or more delayed series were obtained after a mean interval of 21 min (range 8-33), showing the track was no longer visible (n = 3) or was of progressively decreased conspicuity (n = 2).
  
  
  CONCLUSIONS
  Accurate targeting during direct MRI-guided biopsy of the prostate can be confirmed by obtaining post-biopsy in-plane images, since the needle track is usually visible as a transient linear tissue distortion.
authors: Department of Diagnostic Radiology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Mail Code: L340, Portland, OR, 97239, USA.
authors: Alexander J
authors: AJ
authors: Nicholson
authors: Department of Diagnostic Radiology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Mail Code: L340, Portland, OR, 97239, USA.
authors: David R
authors: DR
authors: Pettersson
authors: Department of Diagnostic Radiology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Mail Code: L340, Portland, OR, 97239, USA.
authors: Elena K
authors: EK
authors: Korngold
authors: Department of Diagnostic Radiology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Mail Code: L340, Portland, OR, 97239, USA.
authors: Bryan R
authors: BR
authors: Foster
authors: Department of Radiation Medicine, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Mail Code: L340, Portland, OR, 97239, USA.
authors: Arthur Y
authors: AY
authors: Hung
authors: Department of Urology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Mail Code: L340, Portland, OR, 97239, USA.
authors: Christopher L
authors: CL
authors: Amling
authors: Department of Diagnostic Radiology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Mail Code: L340, Portland, OR, 97239, USA. coakleyf@ohsu.edu.
authors: Fergus V
authors: FV
authors: Coakley
mesh_terms: D000368:Aged; D006801:Humans; D008279:Magnetic Resonance Imaging; D053783:Magnetic Resonance Imaging, Interventional; D008297:Male; D008875:Middle Aged; D011467:Prostate / Q000473:pathology*; D011471:Prostatic Neoplasms / Q000473:pathology*; D012189:Retrospective Studies
keywords: MRI-guided biopsy; Multiparametric MRI; Prostate