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Related Concept Videos

Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...

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Related Experiment Video

Updated: Jul 2, 2026

Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities
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Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities

Published on: October 27, 2023

Couch Sag Discrepancies Between Planning CT and Radixact: A Wide-area 3D Measurement Study.

Shota Oda1, Ryuichi Yada2, Yusuke Ueshima3

  • 1Next Generation Creative Education Center for Medicine, Engineering, and Informatics, Hamamatsu University School of Medicine, Shizuoka, Japan.

In Vivo (Athens, Greece)
|June 30, 2026
PubMed
Summary

A treatment planning CT couch sagged significantly (4.12 mm), unlike the Radixact system (0.13 mm). This couch motion discrepancy risks compromising radiation therapy accuracy.

Keywords:
Couch sagRadiotherapyRadixactcouch catcher

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Four-Dimensional CT Analysis Using Sequential 3D-3D Registration
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Last Updated: Jul 2, 2026

Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities
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Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities

Published on: October 27, 2023

Four-Dimensional CT Analysis Using Sequential 3D-3D Registration
05:05

Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

Published on: November 23, 2019

Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Imaging Systems

Background:

  • Accurate patient positioning is crucial in radiotherapy.
  • Couch motion, specifically sag, can introduce geometric uncertainties.
  • Comparing couch performance between treatment planning and delivery systems is essential.

Purpose of the Study:

  • To quantitatively compare couch motion, particularly sag, between a treatment planning CT and a Radixact system.
  • To evaluate the effectiveness of a couch catcher in mitigating sag.
  • To assess the impact of observed discrepancies on treatment accuracy.

Main Methods:

  • Utilized a wide-area three-dimensional coordinate measuring machine for precise measurements.
  • Applied a 60 kg load to each couch system.
  • Measured 3D positions at 200 mm increments up to 1,200 mm to assess sag, longitudinal accuracy, and lateral deviation.

Main Results:

  • Treatment planning CT exhibited significant sag (max 4.12 mm on Z-axis).
  • Radixact system with couch catcher showed minimal sag (max 0.13 mm).
  • Both systems demonstrated high longitudinal accuracy and minimal lateral deviation, but the sag difference poses a risk.

Conclusions:

  • A 3D coordinate measuring machine provides accurate couch motion assessment.
  • Significant discrepancies in couch sag exist between treatment planning CT and Radixact systems.
  • These findings necessitate accounting for couch sag during treatment planning to ensure accuracy.