kV cone-beam CT-based IGRT: a clinical review
Judit Boda-Heggemann1, Frank Lohr, Frederik Wenz
1Department of Radiation Oncology, University Medical Center Mannheim, University of Heidelberg, Mannheim, Germany. judit.boda-heggemann@umm.de
Summary
Image-guided radiotherapy using cone-beam computed tomography (CBCT) enhances precision in radiation delivery. This advanced imaging allows for reduced margins, better organ sparing, and improved tumor control with lower toxicity.
Area of Science:
- Radiation Oncology
- Medical Imaging
- Cancer Treatment
Background:
- Advanced radiation therapy requires precise target definition and dose delivery.
- Intensity-modulated radiotherapy (IMRT) and narrow planning target volume (PTV) margins are crucial for sparing organs at risk.
- Three-dimensional image-guided radiotherapy (IGRT) with cone-beam computed tomography (CBCT) offers superior target localization compared to 2D IGRT.
Purpose of the Study:
- To review the clinical applications of gantry-mounted kilovoltage CBCT systems.
- To focus on CBCT use in frequently targeted sites: prostate, lung, and head and neck.
- To discuss alternative imaging methods and their comparative advantages/disadvantages.
Main Methods:
- Literature review of clinical applications of CBCT in IGRT.
- Analysis of CBCT's role in target volume definition and dose delivery.
- Comparison of CBCT with alternative imaging techniques.
Main Results:
- IGRT with soft tissue detection significantly improves set-up accuracy, replacing older verification methods.
- CBCT enables monitoring of tumor and normal tissue changes, allowing for adaptive radiotherapy.
- Reduced safety margins and improved patient repositioning precision are achieved with CBCT.
Conclusions:
- CBCT facilitates daily pretreatment verification and online correction of patient positioning errors.
- This precision allows for shrinking safety margins, sparing organs at risk, and escalating radiation doses.
- A positive trend towards improved clinical outcomes is observed with CBCT-based IGRT.
Related Concept Videos
01:27Imaging 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...
01:14Imaging Studies I: CT and MRI
Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...