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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:
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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

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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 III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

Imaging Studies III: Computed Tomography

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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

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Clinical Imaging of Microwave Mammography

Clinical Imaging of Microwave Mammography

Published on: November 14, 2025

The performance characteristics of a simulator-based CT scanner.

K Maureemootoo¹, S Webb, M O Leach

¹Inst. of Cancer Res. and R. Marsden Hospital, Sutton.

IEEE Transactions on Medical Imaging

|January 1, 1988

Summary

This study introduces a modified computed tomographic (CT) simulator for radiotherapy. The prototype equipment provides images suitable for planning whole-organ treatments, like breast cancer management.

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Area of Science:

Medical Imaging
Radiotherapy Technology
Oncology

Background:

Accurate imaging is crucial for effective radiotherapy planning.
Current methods may have limitations for whole-organ treatment volumes.
The development of specialized CT simulators can enhance treatment precision.

Purpose of the Study:

To evaluate a prototype CT simulator for radiotherapy planning.
To assess the suitability of CT images for whole-organ treatment volumes.
To report the performance characteristics of the novel simulator.

Main Methods:

Utilized a modified radiotherapy simulator (prototype Royal Marsden Hospital CT simulator).
Acquired computed tomographic (CT) images under typical clinical scanning conditions.
Analyzed image quality and performance metrics relevant to radiotherapy planning.

Main Results:

The prototype CT simulator successfully generated images suitable for radiotherapy planning.
Images were found appropriate for whole-organ treatment volumes, including breast cancer management.
Performance characteristics were evaluated under standard clinical conditions.

Conclusions:

The modified CT simulator is a viable tool for radiotherapy planning, particularly for whole-organ treatments.
The prototype demonstrates potential for improving treatment accuracy in conservative breast cancer management.
Further evaluation of its clinical performance is warranted.