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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.
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 for Cardiovascular System V: CT

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...

Imaging Studies I: CT and MRI

Imaging 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...

Radiological Investigation I: X-ray and CT

Radiological Investigation I: X-ray and CT

Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and the...

Imaging Studies III: Computed Tomography

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...

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...

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Related Experiment Video

Updated: Jul 20, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

Published on: May 9, 2014

Kilovoltage CT using a linac-CT scanner combination.

C Thieke¹, U Malsch, W Schlegel

¹Department of Radiation Oncology, University Hospital of Heidelberg and German Cancer Research Center, Heidelberg.

The British Journal of Radiology

|September 19, 2006

Summary

Accurate radiation therapy requires precise dose delivery. This study introduces a linac-CT system to correct interfractional variations, improving treatment accuracy for various cancers.

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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

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Published on: May 9, 2014

Contrast Enhanced Vessel Imaging using MicroCT

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Use of a Linear Accelerator for Conducting In Vitro Radiobiology Experiments

Use of a Linear Accelerator for Conducting In Vitro Radiobiology Experiments

Published on: May 26, 2019

Area of Science:

Radiation Oncology
Medical Physics
Image-Guided Therapy

Background:

Modern radiotherapy techniques enable precise dose delivery, conforming to tumor targets while sparing organs at risk.
Accurate dose accumulation relies on the delivered dose matching the planned dose, necessitating precise patient repositioning and accounting for anatomical changes during treatment.

Purpose of the Study:

To describe a system combining a linear accelerator and CT scanner for quantifying and correcting interfractional variations in radiation therapy.
To evaluate the efficacy of this system in treatments for prostate, paraspinal, and head and neck tumors.

Main Methods:

Patients were immobilized with custom devices and treated in a stereotactic setup.
Frequent CT scans were acquired during treatment, compared to the planning CT using manual and automatic rigid matching.
Adaptations were performed offline or in real-time based on detected interfractional errors.

Main Results:

The linac-CT system allows for quantification and correction of interfractional variations.
The described methods enable adaptation to anatomical changes during the treatment course.
Successful application in prostate, paraspinal, and head and neck cancer treatments is demonstrated.

Conclusions:

A linac-CT system facilitates accurate interfractional error detection and correction in radiation therapy.
This approach enhances the exploitation of advanced radiotherapy techniques by ensuring delivered dose accuracy.
The described procedural steps support the implementation of image-guided adaptive radiation therapy.