title: Technique for a hybrid system of real-time transrectal ultrasound with preoperative magnetic resonance imaging in the guidance of targeted prostate biopsy.
abstract: Diagnostic magnetic resonance imaging (MRI) for prostate has achieved increasingly higher levels of accuracy. Because real-time MR-guided targeted biopsy is still a complicated and expensive procedure, there is considerable interest in a technique of MR/transrectal ultrasound (TRUS) hybridized image-guided biopsy. However, because the 3-D shapes of the prostate at the time of image-acquisition at preoperative MRI are likely to be different from the intra-operative TRUS images, the precise registration of each 3-D volume data is critical. To reduce the potential errors in registration of TRUS with MRI, we introduce new procedural techniques in a rigid image fusion technique. First, preoperative MR images were obtained with a specifically-made plastic outer-frame, with exactly the same shape as the real TRUS probe, placed in the rectum, in order to simulate the deformation of the prostate caused by the absence or presence of a TRUS probe during the acquisition of MR or TRUS images. Second, instead of using a single plane of longitudinal image, we applied biplane TRUS images to be shown in parallel on a multiplanar display with corresponding reconstructed MRI, in order to register both horizontal and longitudinal images of the prostate simultaneously, thereby achieving improved 3-D anatomical matching.
authors.affiliation: Department of Urology, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kyoto, Japan. ukimura@koto.kpu-m.ac.jp
authors.forename: Osamu
authors.initials: O
authors.lastname: Ukimura
authors.forename: Naoki
authors.initials: N
authors.lastname: Hirahara
authors.forename: Atsuko
authors.initials: A
authors.lastname: Fujihara
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yamada
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Iwata
authors.forename: Kazumi
authors.initials: K
authors.lastname: Kamoi
authors.forename: Koji
authors.initials: K
authors.lastname: Okihara
authors.forename: Hirotoshi
authors.initials: H
authors.lastname: Ito
authors.forename: Tsunehiko
authors.initials: T
authors.lastname: Nishimura
authors.forename: Tsuneharu
authors.initials: T
authors.lastname: Miki
mesh_terms: D001707:Biopsy, Needle / Q000379:methods*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D008297:Male; D011467:Prostate / Q000000981:diagnostic imaging* / Q000473:pathology; D011471:Prostatic Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D025321:Surgery, Computer-Assisted / Q000379:methods*; D018084:Ultrasonography, Interventional / Q000295:instrumentation / Q000379:methods*