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Prostate Cancer Overview
| Conventional TRUS is performed at low frequencies (7-12 MHz) that enhance tissue penetration, but this limits resolution at the peripheral zone of the prostate, where more than 80% of prostate cancers are located. High-frequency TRUS on the other hand, operates in the 16-21 MHz range, which permits far greater resolution of prostatic architecture, particularly in the peripheral zone of the prostate. See the results from the initial study of high-resolution ultrasound on the left, note the correlation between pathological analysis of prostate tissue, high-resolution and standard ultrasound. New anatomic differences between prostate cancers and benign prostate tissue are currently being elucidated with the high-resolution machine. See more images of high-resolution ultrasound below.|
The study team is hopeful that this new technology will allow for more accurate detection of clinically significant prostate cancers.Far less cumbersome than prostate MRI, high-resolution TRUS imaging of the prostate is done at the same setting as the biopsy, takes less than 15 minutes to perform, and does not involve an intravenous contrast agent. If the data continue to be promising, this new imaging technology may one day become an important part of prostate cancer diagnosis and surveillance. The current trial is open to men without a known diagnosis of prostate cancer who have indications for prostate biopsy (rising PSA, elevated PSA, and/or abnormal digital rectal examination), and involves a consultation and examination, followed by a TRUS-guided prostate biopsy. Pathologic review of the specimens is then done by world class genitourinary pathologists at Johns Hopkins.
High-resolution ultrasound demonstrating a benign prostatic hyperplasia (BPH)
nodule (top) and prostate cancer (below)