Journal
INTERNATIONAL JOURNAL OF UROLOGY
Volume 17, Issue 10, Pages 890-893Publisher
WILEY
DOI: 10.1111/j.1442-2042.2010.02617.x
Keywords
image registration; magnetic resonance imaging; prostate biopsy; prostate cancer; transrectal ultrasound
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Funding
- Japan Society for the Promotion of Science [21659378]
- Grants-in-Aid for Scientific Research [21659378] Funding Source: KAKEN
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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.
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