How to Appropriately Calculate Effective Dose for CT Using Either Size-Specific Dose Estimates or Dose-Length Product

AJR. American Journal of Roentgenology
Samuel L BradyRobert A Kaufman

Abstract

The purpose of this study is to show how to calculate effective dose in CT using size-specific dose estimates and to correct the current method using dose-length product (DLP). Data were analyzed from 352 chest and 241 abdominopelvic CT images. Size-specific dose estimate was used as a surrogate for organ dose in the chest and abdominopelvic regions. Organ doses were averaged by patient weight-based populations and were used to calculate effective dose by the International Commission on Radiological Protection (ICRP) report 103 method using tissue-weighting factors (EICRP). In addition, effective dose was calculated using population-averaged CT examination DLP for the chest and abdominopelvic region using published k-coefficients (EDLP = k × DLP). EDLP differed from EICRP by an average of 21% (1.4 vs 1.1) in the chest and 42% (2.4 vs 3.4) in the abdominopelvic region. The differences occurred because the published kcoefficients did not account for pitch factor other than unity, were derived using a 32-cm diameter CT dose index (CTDI) phantom for CT examinations of the pediatric body, and used ICRP 60 tissue-weighting factors. Once it was corrected for pitch factor, the appropriate size of CTDI phantom, and ICRP 103 tissue-weigh...Continue Reading

References

Jun 18, 1975·Radiation and Environmental Biophysics·W Jacobi
Jun 7, 2000·Medical Physics·C H McCollough, B A Schueler
Oct 17, 2002·The British Journal of Radiology·A KhursheedB F Wall
Dec 24, 2004·European Heart Journal·Lennart G BongartzBranko Braam
Jul 25, 2007·The British Journal of Radiology·C J Martin
Apr 30, 2008·The British Journal of Radiology·D J Brenner
Aug 20, 2008·Radiology·Walter HudaMohammad R Khorasani
Apr 28, 2011·Medical Physics·Walter HudaWenjun He
Jul 24, 2012·Radiology·William R Hendee, Michael K O'Connor
May 3, 2013·Medical Physics·Maryam KhatonabadiMichael F McNitt-Gray

❮ Previous
Next ❯

Citations

Apr 8, 2016·Pediatric Radiology·Boaz KarmazynS Gregory Jennings
Jun 23, 2016·Expert Review of Respiratory Medicine·Peter D Sly, Claire E Wainwright
Jun 15, 2017·The British Journal of Radiology·David J MurphyMichael L Steigner
Mar 12, 2019·Physics in Medicine and Biology·S RosendahlT Siiskonen
Mar 10, 2019·Journal of Applied Clinical Medical Physics·Elanchezhian SomasundaramSamuel L Brady
Apr 25, 2017·Pediatric Radiology·Peter K T HuiSuvipaporn Siripornpitak
Feb 28, 2021·Clinical Radiology·C M McLeavyR M Hawkins
Jul 9, 2017·Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine·Frederic H FaheyStephan D Voss
Dec 1, 2021·Veterinary and Comparative Orthopaedics and Traumatology : V.C.O.T·Daniel J WillsKenneth A Johnson

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.