Related Experiment Video
Updated: Aug 9, 2026
10:33
Expedited Radiation Biodosimetry by Automated Dicentric Chromosome Identification (ADCI) and Dose Estimation
Published on: September 4, 2017
Effective dose equivalents, HE, in diagnostic radiology
1Department of Medical Physics, Manitoba Cancer Treatment and Research Foundation, Winnipeg, Canada.
Medical Physics
|November 1, 1990
Summary
This study presents effective dose equivalent (HE) data for common radiological exams, calculated using Monte Carlo methods. The findings help estimate patient radiation exposure across various X-ray settings and projections.
Area of Science:
- Medical Physics
- Radiological Protection
- Computational Dosimetry
Background:
- Accurate estimation of effective dose equivalent (HE) is crucial for radiological protection.
- Standardized data for common radiological examinations is needed to assess patient exposure.
- Previous methods may not cover the range of parameters used in modern diagnostic imaging.
Purpose of the Study:
- To provide values of effective dose equivalent (HE) per unit entrance skin dose for twelve common radiological examinations.
- To present HE data as functions of X-ray kilovoltage peak (kVp), beam filtration, and projection.
- To offer methods for computing HE values for different field sizes.
Main Methods:
- Organ doses were calculated for a standard man phantom using Monte Carlo techniques.
- HE values were derived from these organ doses for specific beam sizes.
- Data were analyzed as a function of kVp, filtration (mm Al), and projection (AP, PA, lateral, oblique).
Main Results:
- Effective dose equivalent (HE) data per unit entrance skin dose are presented for twelve common radiological examinations.
- HE values are shown as functions of kVp, beam filtration, and projection.
- Two methods are provided for calculating HE for different field sizes.
Conclusions:
- The presented HE data provide valuable reference information for estimating patient radiation doses in diagnostic radiology.
- The developed methods allow for more accurate dose assessments across a range of examination parameters and field sizes.
- This work contributes to improved radiation protection practices in medical imaging.
Related Concept Videos
02:59Biological Effects of Radiation
All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...
01:24X-ray Imaging
German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...
01:29Positron Emission Tomography
Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...
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...
01:25Imaging 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
Fundamental Principles of PET
01:21Dose Size and Dosing Frequency: Determination Methods
Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...