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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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,...
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Magnetic Resonance Imaging

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...

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Updated: Jul 10, 2026

Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy
09:11

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Published on: April 9, 2019

MRI-Only Simulation for Prostate MRI-Guided SBRT.

Marvin Kinz1, Jennifer Campbell2, Cassandra L Bullens2

  • 1Department of Radiation Oncology, Brigham and Women's Hospital, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA; Mannheim Institute for Intelligent Systems in Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim 68167, Germany; Department of Physics and Astronomy, Heidelberg University, 69117 Heidelberg, Germany; Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University, 69117 Heidelberg, Germany.

Practical Radiation Oncology
|July 8, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces an MRI-only workflow for prostate SBRT, eliminating the need for CT scans. This streamlined approach enhances efficiency and patient comfort while maintaining treatment accuracy.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiology

Background:

  • The Stereotactic MR-Guided Adaptive Radiation Therapy (SMART) protocol for prostate SBRT utilizes 3T-MRI for delineation and 0.35T MR-Linac for adaptation.
  • Current workflows involve multiple simulation scans (CT, 3T-MRI, 0.35T-MRI), leading to logistical challenges and inefficiencies.

Purpose of the Study:

  • To develop and validate an end-to-end MRI-only workflow for prostate SBRT.
  • To eliminate the requirement for a planning CT scan (pCT), thereby improving workflow efficiency and reducing patient burden.

Main Methods:

  • Ten prostate cancer patients underwent simulation using a 3T Siemens MAGNETOM Vida MRI scanner.
  • High-resolution T2-weighted BLADE/DWI sequences were used for target delineation, and a T1-weighted DIXON VIBE sequence generated a synthetic CT (sCT) using a deep-learning algorithm.
  • Treatment plans were created and delivered on a 0.35T MRIdian MR-Linac, with retrospective pCT-based plan recalculations on sCTs for validation using DVH and gamma index analysis.

Main Results:

  • The MRI-only workflow was successfully implemented clinically.
  • Dosimetric validation showed high fidelity between sCT and pCT calculations, with computed γ-indices of 96.80±1.33% (2%DD, 2mm DTA) and 99.98±0.03% (3%DD, 2mm DTA).
  • Mean absolute differences in PTV D95% were minimal (0.06±0.14 Gy).

Conclusions:

  • Integrating 3T MR simulation with 0.35T MR-Linac delivery via an sCT pathway is clinically feasible and dosimetrically robust.
  • MRI-only simulation enhances workflow efficiency and reduces patient burden.
  • This approach maintains the high-quality 3T delineation and MR-guidance characteristic of the SMART protocol.