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Imaging Studies IV: Magnetic Resonance Imaging

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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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Updated: Mar 2, 2026

Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy

Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy

Published on: April 9, 2019

SU-E-J-152: Prostate IGRT: CT-MRI Fusion and Target Delineation Accuracy.

J Xue^1,2,3, X Chen^1,2,3, L Chen^1,2,3

¹Cancer Center of Union Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China.

Medical Physics

|May 19, 2017

Summary

This summary is machine-generated.

CT-MRI fusion accuracy for prostate cancer radiotherapy is crucial. Significant prostate shifts occurred due to bladder/rectal volume changes, impacting target delineation accuracy in image-guided radiotherapy.

Keywords:

Cancer Computed tomography Data fusion Dosimetry Germanium Image guided radiation therapy Image scanners Magnetic resonance imaging Medical imaging Radiation therapy

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Last Updated: Mar 2, 2026

Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy

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MR Molecular Imaging of Prostate Cancer with a Small Molecular CLT1 Peptide Targeted Contrast Agent

MR Molecular Imaging of Prostate Cancer with a Small Molecular CLT1 Peptide Targeted Contrast Agent

Published on: September 3, 2013

Area of Science:

Radiotherapy and Oncology
Medical Imaging
Prostate Cancer Treatment

Background:

Accurate image fusion is vital for precise radiotherapy targeting in prostate cancer.
CT-MR imaging fusion combines CT for dose calculation and MR for target delineation.

Purpose of the Study:

To evaluate the accuracy of CT-MR imaging fusion for prostate cancer image-guided radiotherapy (IGRT).
To assess the impact of anatomical variations on CT-MR fusion accuracy.

Main Methods:

Sixty-nine prostate cancer patients underwent CT/MR simulation.
Prostate, rectum, and bladder were delineated on CT and MR images.
Prostate center shifts and volume variations were calculated to assess fusion accuracy.

Main Results:

Bony structures fused accurately, but soft tissue shifts occurred due to bladder/rectal volume changes.
Maximal prostate shifts reached 8mm in the AP direction, with 15.9% of patients showing >3mm shifts.
Prostate shifts correlated with rectal volume differences, particularly in Calypso patients.

Conclusions:

Significant prostate target shifts are linked to bladder/rectal volume variations between CT and MR scans.
Residual fusion errors in soft tissue targets require attention.
Corrections are necessary to ensure accurate target delineation in prostate IGRT.