Related Experiment Video
Updated: May 26, 2026
04:40
Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
Published on: August 28, 2018
Diagnostic reference level of computed tomography (CT) in Japan
Yasuhiro Fukushima1, Yoshito Tsushima, Hiroyuki Takei
1Department of Radiology, Gunma University Hospital, Maebashi, Gunma, Japan. yfukushi@gunma-u.ac.jp
Radiation Protection Dosimetry
|December 8, 2011
Summary
This study established computed tomography (CT) diagnostic reference levels (DRL) in Japan using dose-length product (DLP). Pediatric head CT DLP in Japan was higher than in other regions, while adult CT DLP was comparable.
Area of Science:
- Medical Imaging
- Radiology
- Radiation Protection
Background:
- Optimizing computed tomography (CT) parameters is crucial for minimizing radiation exposure.
- Diagnostic Reference Levels (DRLs) serve as benchmarks for radiation dose in medical imaging.
Purpose of the Study:
- To establish the DRLs for CT examinations in Japan using dose-length product (DLP).
- To evaluate DLP distributions across different anatomical regions and age groups.
Main Methods:
- Data collection from hospitals/clinics in Gunma prefecture, Japan, for CT scans performed in June 2010.
- Analysis of dose-length product (DLP) distributions for eight anatomical regions and five age groups.
- DRLs defined as the 25th and 75th percentiles of DLP.
Main Results:
- Data from 80 institutions and 26,090 patients were analyzed.
- Pediatric head CT DLP in Japan was found to be higher compared to reported DRLs from the EU and Syria.
- Adult patient DLP levels across various anatomical regions were comparable to international benchmarks.
Conclusions:
- The study provides initial DRLs for CT in Japan, highlighting a need for optimization in pediatric head CT protocols.
- Findings suggest that adult CT protocols in Japan are generally aligned with international standards.
- Further research with larger sample sizes is recommended to refine these DRLs.
Related Concept Videos
01:10Computed 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...
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...
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...
01:25Imaging 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...
01:28Imaging 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...
01:30Radiological 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...
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...