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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...
Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
Imaging Studies for Cardiovascular System V: CT01:28

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 for Cardiovascular System VI: Calcium -Scoring CT01:25

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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Updated: Jun 6, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

The dose from Compton backscatter screening.

Peter Rez1, Robert L Metzger, Kenneth L Mossman

  • 1Department of Physics, Arizona State University, Tempe, AZ 85287-1504, USA. peter.rez@asu.edu

Radiation Protection Dosimetry
|November 12, 2010
PubMed
Summary
This summary is machine-generated.

Compton backscatter X-ray screening systems for security pose minimal health risks. Effective dose depends on image resolution, with larger pixel sizes improving compliance with safety standards.

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Last Updated: Jun 6, 2026

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Area of Science:

  • Medical Imaging
  • Radiation Physics
  • Security Technology

Background:

  • Compton backscatter X-ray systems are used for security screening of people and vehicles.
  • Understanding radiation dose is crucial for these applications.

Purpose of the Study:

  • To calculate radiation doses for personnel and vehicle screening using Compton backscatter X-rays.
  • To assess the impact of image resolution on effective dose.

Main Methods:

  • Calculated entrance skin dose and 1 cm depth dose using scattering cross sections and absorption coefficients.
  • Estimated effective dose using established conversion coefficients.
  • Analyzed the relationship between effective dose and image pixel size.

Main Results:

  • Effective dose is significantly influenced by image resolution (pixel size).
  • Personnel screening systems may not meet ANSI standard NS 43.17 with pixel sizes <4 mm.
  • Calculated effective doses remain below levels associated with adverse health effects.

Conclusions:

  • Compton backscatter X-ray screening is a safe technology with manageable radiation doses.
  • Optimizing pixel size is important for regulatory compliance.
  • The technology poses no significant health risks to screened individuals.