Related Experiment Video
Updated: Apr 13, 2026
06:08
A Cognitive Fusion-guided Prostate Biopsy Using Multiparametric Magnetic Resonance Imaging and Transrectal Ultrasound
Published on: March 21, 2025
2.0K
Prostate tumor delineation using multiparametric magnetic resonance imaging: Inter-observer variability and pathology
Peter Steenbergen1, Karin Haustermans2, Evelyne Lerut3
1Department of Radiation Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
Summary
Radiotherapy dose escalation to dominant prostate cancer lesions is feasible, as most dominant tumors were consistently identified by multiple teams on MRI. However, maintaining whole prostate coverage is crucial to address smaller or undetected lesions.
Area of Science:
- Oncology
- Radiotherapy
- Medical Imaging
Background:
- Dose escalation to dominant lesions in prostate cancer radiotherapy may improve outcomes.
- Accurate tumor detection and delineation on multiparametric MRI (mp-MRI) are critical for this strategy.
Purpose of the Study:
- To assess the agreement among radiation oncologists and radiologists in delineating prostate cancer lesions on mp-MRI.
- To determine the accuracy of lesion detection and delineation using histopathology as a reference.
Main Methods:
- Six observer teams delineated tumors on mp-MRI from 20 prostatectomy patients.
- Inter-observer agreement was evaluated by calculating the standard deviation (SD) of contours for universally identified tumor sites.
Main Results:
- All teams identified 18 of 89 lesions, all of which were dominant lesions with a median volume of 2.4 cm³.
- The median inter-observer SD for delineations was 0.23 cm.
- A significant number of smaller (satellite) lesions were missed by all teams.
Conclusions:
- Dose escalation to dominant prostate cancer lesions is feasible due to high inter-observer agreement.
- Maintaining sufficient dose to the entire prostate is necessary to avoid undertreatment of smaller or undetected lesions.
Related Concept Videos
01:27Imaging Studies IV: Magnetic Resonance Imaging
370
Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
370
01:24Magnetic Resonance Imaging
10.5K
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
10.5K