Organ and Effective Dose Coefficients for Common Computed Tomography Protocols Using the UF/NCI Family of Computational ...

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Material Information

Title:
Organ and Effective Dose Coefficients for Common Computed Tomography Protocols Using the UF/NCI Family of Computational Reference Phantoms
Physical Description:
1 online resource (120 p.)
Language:
english
Creator:
Stepusin, Elliott J
Publisher:
University of Florida
Place of Publication:
Gainesville, Fla.
Publication Date:

Thesis/Dissertation Information

Degree:
Master's ( M.S.)
Degree Grantor:
University of Florida
Degree Disciplines:
Biomedical Engineering
Committee Chair:
BOLCH,WESLEY EMMETT
Committee Co-Chair:
HINTENLANG,DAVID ERIC
Committee Members:
RILL,LYNN NEITZEY

Subjects

Subjects / Keywords:
computed -- dose -- dosimetry -- modulation -- phantom -- tomography
Biomedical Engineering -- Dissertations, Academic -- UF
Genre:
Biomedical Engineering thesis, M.S.
bibliography   ( marcgt )
theses   ( marcgt )
government publication (state, provincial, terriorial, dependent)   ( marcgt )
born-digital   ( sobekcm )
Electronic Thesis or Dissertation

Notes

Abstract:
Due to the rapid growth of computed tomography (CT) examinations in the United States, there is a need for accurate CT size-specific organ dosimetry that accounts for tube current modulation (TCM). Past studies validate the use of a slice-by-slice CT dosimetry methodology for the Toshiba Aquilion ONE scanner that can accurately account for TCM, and can be implemented for a multitude of exam types. Physical anthropomorphic phantom dosimetry data was used a basis to further validate this algorithm for different size reference phantoms. The average magnitude of percent error in the computed dose to all in-field organs of torso exams when compared to measured values was 8.5%. For head exams, the average magnitude in percent error of in-field organ doses was 6.9%. This methodology was then applied to The University of Florida Family of Reference Hybrid Phantoms across a wide range of clinically relevant scan protocols. This data provides age and gender-specific organ dose calculations that can be scaled by average effective mAs to calculate absolute organ dose. Additionally, effective dose coefficients in units of microsievert per milligray-centimeter were calculated for each reference hybrid phantom, as well as a reference dose coefficient. These coefficients, when applied to the physical phantom data show a relative error in effective dose of 14.6% and 12.5% for the reference and phantom-specific coefficients, respectively. Calculating effective dose using the millisievert per average effective mAs for each phantom yielded an average dosimetric error of 6.4%.
General Note:
In the series University of Florida Digital Collections.
General Note:
Includes vita.
Bibliography:
Includes bibliographical references.
Source of Description:
Description based on online resource; title from PDF title page.
Source of Description:
This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
Statement of Responsibility:
by Elliott J Stepusin.
Thesis:
Thesis (M.S.)--University of Florida, 2014.
Local:
Adviser: BOLCH,WESLEY EMMETT.
Local:
Co-adviser: HINTENLANG,DAVID ERIC.
Electronic Access:
RESTRICTED TO UF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USE UNTIL 2015-05-31

Record Information

Source Institution:
UFRGP
Rights Management:
Applicable rights reserved.
Classification:
lcc - LD1780 2014
System ID:
UFE0046812:00001