Related Experiment Video
Updated: May 17, 2026
X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
Published on: September 11, 2011
Radiological protection in paediatric computed tomography
P-L Khong1, D Frush, H Ringertz
1Department of Diagnostic Radiology, Queen Mary Hospital, The University of Hong Kong, Hong Kong. plkhong@hku.hk
Insights
Pediatric patients face higher cancer risks from radiation due to longer life expectancy and sensitive developing tissues. Implementing radiation protection strategies and optimizing computed tomography (CT) scan parameters are crucial for minimizing cumulative radiation dose in children.
Area of Science:
- Medical Imaging
- Radiology
- Pediatric Oncology
Background:
- Pediatric patients are more susceptible to radiation-induced cancer than adults.
- Cumulative radiation doses from multiple computed tomography (CT) scans can increase cancer risk.
- Developing organs and tissues in children are highly sensitive to radiation effects.
Purpose of the Study:
- To outline radiation protection strategies for pediatric CT examinations.
- To emphasize dose reduction techniques and technologies in pediatric radiology.
- To highlight the importance of optimizing CT protocols for young patients.
Main Methods:
- Rigorous justification of CT examinations.
- Utilizing non-ionizing imaging techniques where feasible.
- Optimizing radiation dose according to the 'as low as reasonably achievable' (ALARA) principle.
- Adjusting scan parameters (mAs, kVp, pitch) based on patient factors and study indication.
- Employing advanced dose reduction technologies like tube current modulation and iterative reconstruction.
- Restricting multiphase scans and overlapping regions, focusing only on the area of interest.
- Optimizing image quality through post-processing.
Main Results:
- Successful implementation of radiation protection strategies can significantly reduce cumulative radiation doses in pediatric CT.
- Dose reduction is achievable through careful adjustment of scan parameters and utilization of modern CT technology.
- Optimized imaging protocols ensure diagnostic quality while minimizing radiation exposure.
Conclusions:
- A multi-faceted approach involving justification, optimization, and advanced technology is essential for effective radiation protection in pediatric CT.
- Continuous education, advocacy, and further research are vital for advancing pediatric radiological protection.
- Minimizing radiation dose in pediatric CT examinations is critical to reduce long-term cancer risks.
Abstract:
It is well known that paediatric patients are generally at greater risk for the development of cancer per unit of radiation dose compared with adults, due both to the longer life expectancy for any harmful effects of radiation to manifest, and the fact that developing organs and tissues are more sensitive to the effects of radiation. Multiple computed tomography (CT) examinations may cumulatively involve absorbed doses to organs and tissues that can sometimes approach or exceed the levels known from epidemiological studies to significantly increase the probability of cancer development. Radiation protection strategies include rigorous justification of CT examinations and the use of imaging techniques that are non-ionising, followed by optimisation of radiation dose exposure (according to the 'as low as reasonably achievable' principle). Special consideration should be given to the availability of dose reduction technology when acquiring CT scanners. Dose reduction should be optimised by adjustment of scan parameters (such as mAs, kVp, and pitch) according to patient weight or age, region scanned, and study indication (e.g. images with greater noise should be accepted if they are of sufficient diagnostic quality). Other strategies include restricting multiphase examination protocols, avoiding overlapping of scan regions, and only scanning the area in question. Newer technologies such as tube current modulation, organ-based dose modulation, and iterative reconstruction should be used when appropriate. Attention should also be paid to optimising study quality (e.g. by image post-processing to facilitate radiological diagnoses and interpretation). Finally, improving awareness through education and advocacy, and further research in paediatric radiological protection are important to help reduce patient dose.
Related Concept Videos
01:10Computed Tomography
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...
01:13Radiological Investigation III: Pulmonary Angiogram and 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...
01:30Radiological Investigation I: X-ray and CT
01:20Imaging Studies for Cardiovascular System III: X-Ray
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
01:14Imaging Studies I: CT and MRI
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...
01:27Imaging Studies III: Computed Tomography