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Computed Tomography

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.
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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

[Cone beam CT based image guided radiotherapy: implementation and clinical use].

R de Crevoisier¹, R Garcia, G Louvel

¹Département de Radiothérapie, Centre Eugène-Marquis, CS44229, 35000 Rennes cedex, France. r.de-crevoisier@rennes.fnclcc.fr

Cancer Radiotherapie : Journal De La Societe Francaise De Radiotherapie Oncologique

|August 22, 2009

Summary

Cone beam CT (CBCT) offers volumetric imaging for image- and dose-guided radiotherapy (IGRT) on linear accelerators. This technique shows promise for precise treatment of mobile tumors, though clinical experience and optimization are ongoing.

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Published on: December 2, 2013

Area of Science:

Medical Physics
Radiotherapy Technology
Oncology Imaging

Background:

Cone beam CT (CBCT) utilizes an X-ray tube and flat panel detector for volumetric imaging during radiotherapy.
It is integrated into modern linear accelerators, enabling image- and dose-guided radiotherapy (IGRT and DGRT).

Purpose of the Study:

To describe the technical aspects and clinical applications of kV cone beam CT in radiotherapy.
To highlight the potential benefits and challenges of CBCT-based IGRT.

Main Methods:

Acquisition of hundreds of projections during one gantry rotation around the patient.
Utilizing CBCT for volumetric imaging in the treatment position.

Main Results:

CBCT enables precise IGRT for mobile tumors requiring stereotactic, hypofractionated, or high-dose radiotherapy.
Current clinical experience is limited, primarily involving prostate, head and neck, and lung tumors.
Registration and treatment protocols are described, with quality control and training identified as key issues.

Conclusions:

CBCT-based IGRT is an emerging technique requiring further optimization.
It holds significant potential clinical benefit when combined with intensity-modulated radiotherapy and advanced imaging for target delineation.