An automated technique for estimating patient-specific regional imparted energy and dose in TCM CT exams

Jeremiah W. Sanders, Xiaoyu Tian, W. Paul Segars, John M Boone, Ehsan Samei

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Currently computed tomography (CT) dosimetry relies on CT dose index (CTDI) and size specific dose estimates (SSDE). Organ dose is a better metric of radiation burden. However, organ dose estimation requires precise knowledge of organ locations. Regional imparted energy and dose can also be used to quantify radiation burden. Estimating the imparted energy from CT exams is beneficial in that it does not require precise estimates of the organ size or location. This work investigated an automated technique for retrospectively estimating the imparted energy from chest and abdominopelvic tube current modulated (TCM) CT exams. Monte Carlo simulations of chest and abdominopelvic TCM CT examinations across various tube potentials and TCM strengths were performed on 58 adult computational extended cardiac-torso (XCAT) phantoms to develop relationships between scanned mass and imparted energy normalized by dose length product (DLP). An automated algorithm for calculating the scanned patient volume was further developed using an open source mesh generation toolbox. The scanned patient volume was then used to estimate the scanned mass accounting for diverse density within the scan region. The scanned mass and DLP from the exam were used to estimate the imparted energy to the patient using the knowledgebase developed from the Monte Carlo simulations. Patientspecific imparted energy estimates were made from 20 chest and 20 abdominopelvic clinical CT exams. The average imparted energy was 274 ± 141 mJ and 681 ± 376 mJ for the chest and abdominopelvic exams, respectively. This method can be used to estimate the regional imparted energy and/or regional dose in chest and abdominopelvic TCM CT exams across clinical operations.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2016: Physics of Medical Imaging
PublisherSPIE
Volume9783
ISBN (Electronic)9781510600188
DOIs
StatePublished - 2016
EventMedical Imaging 2016: Physics of Medical Imaging - San Diego, United States
Duration: Feb 28 2016Mar 2 2016

Other

OtherMedical Imaging 2016: Physics of Medical Imaging
CountryUnited States
CitySan Diego
Period2/28/163/2/16

Fingerprint

Tomography
estimating
tomography
chest
tubes
Dosimetry
dosage
Chest Tubes
organs
estimates
energy
Thorax
Radiation
Torso
Mesh generation
torso
Knowledge Bases
Organ Size
radiation
products

Keywords

  • computed tomography
  • patient-specific
  • radiation risk
  • regional dose
  • Regional imparted energy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

Cite this

Sanders, J. W., Tian, X., Segars, W. P., Boone, J. M., & Samei, E. (2016). An automated technique for estimating patient-specific regional imparted energy and dose in TCM CT exams. In Medical Imaging 2016: Physics of Medical Imaging (Vol. 9783). [97833I] SPIE. https://doi.org/10.1117/12.2216413

An automated technique for estimating patient-specific regional imparted energy and dose in TCM CT exams. / Sanders, Jeremiah W.; Tian, Xiaoyu; Segars, W. Paul; Boone, John M; Samei, Ehsan.

Medical Imaging 2016: Physics of Medical Imaging. Vol. 9783 SPIE, 2016. 97833I.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sanders, JW, Tian, X, Segars, WP, Boone, JM & Samei, E 2016, An automated technique for estimating patient-specific regional imparted energy and dose in TCM CT exams. in Medical Imaging 2016: Physics of Medical Imaging. vol. 9783, 97833I, SPIE, Medical Imaging 2016: Physics of Medical Imaging, San Diego, United States, 2/28/16. https://doi.org/10.1117/12.2216413
Sanders JW, Tian X, Segars WP, Boone JM, Samei E. An automated technique for estimating patient-specific regional imparted energy and dose in TCM CT exams. In Medical Imaging 2016: Physics of Medical Imaging. Vol. 9783. SPIE. 2016. 97833I https://doi.org/10.1117/12.2216413
Sanders, Jeremiah W. ; Tian, Xiaoyu ; Segars, W. Paul ; Boone, John M ; Samei, Ehsan. / An automated technique for estimating patient-specific regional imparted energy and dose in TCM CT exams. Medical Imaging 2016: Physics of Medical Imaging. Vol. 9783 SPIE, 2016.
@inproceedings{a57f55d9ba764c248b361ec7ff362778,
title = "An automated technique for estimating patient-specific regional imparted energy and dose in TCM CT exams",
abstract = "Currently computed tomography (CT) dosimetry relies on CT dose index (CTDI) and size specific dose estimates (SSDE). Organ dose is a better metric of radiation burden. However, organ dose estimation requires precise knowledge of organ locations. Regional imparted energy and dose can also be used to quantify radiation burden. Estimating the imparted energy from CT exams is beneficial in that it does not require precise estimates of the organ size or location. This work investigated an automated technique for retrospectively estimating the imparted energy from chest and abdominopelvic tube current modulated (TCM) CT exams. Monte Carlo simulations of chest and abdominopelvic TCM CT examinations across various tube potentials and TCM strengths were performed on 58 adult computational extended cardiac-torso (XCAT) phantoms to develop relationships between scanned mass and imparted energy normalized by dose length product (DLP). An automated algorithm for calculating the scanned patient volume was further developed using an open source mesh generation toolbox. The scanned patient volume was then used to estimate the scanned mass accounting for diverse density within the scan region. The scanned mass and DLP from the exam were used to estimate the imparted energy to the patient using the knowledgebase developed from the Monte Carlo simulations. Patientspecific imparted energy estimates were made from 20 chest and 20 abdominopelvic clinical CT exams. The average imparted energy was 274 ± 141 mJ and 681 ± 376 mJ for the chest and abdominopelvic exams, respectively. This method can be used to estimate the regional imparted energy and/or regional dose in chest and abdominopelvic TCM CT exams across clinical operations.",
keywords = "computed tomography, patient-specific, radiation risk, regional dose, Regional imparted energy",
author = "Sanders, {Jeremiah W.} and Xiaoyu Tian and Segars, {W. Paul} and Boone, {John M} and Ehsan Samei",
year = "2016",
doi = "10.1117/12.2216413",
language = "English (US)",
volume = "9783",
booktitle = "Medical Imaging 2016: Physics of Medical Imaging",
publisher = "SPIE",

}

TY - GEN

T1 - An automated technique for estimating patient-specific regional imparted energy and dose in TCM CT exams

AU - Sanders, Jeremiah W.

AU - Tian, Xiaoyu

AU - Segars, W. Paul

AU - Boone, John M

AU - Samei, Ehsan

PY - 2016

Y1 - 2016

N2 - Currently computed tomography (CT) dosimetry relies on CT dose index (CTDI) and size specific dose estimates (SSDE). Organ dose is a better metric of radiation burden. However, organ dose estimation requires precise knowledge of organ locations. Regional imparted energy and dose can also be used to quantify radiation burden. Estimating the imparted energy from CT exams is beneficial in that it does not require precise estimates of the organ size or location. This work investigated an automated technique for retrospectively estimating the imparted energy from chest and abdominopelvic tube current modulated (TCM) CT exams. Monte Carlo simulations of chest and abdominopelvic TCM CT examinations across various tube potentials and TCM strengths were performed on 58 adult computational extended cardiac-torso (XCAT) phantoms to develop relationships between scanned mass and imparted energy normalized by dose length product (DLP). An automated algorithm for calculating the scanned patient volume was further developed using an open source mesh generation toolbox. The scanned patient volume was then used to estimate the scanned mass accounting for diverse density within the scan region. The scanned mass and DLP from the exam were used to estimate the imparted energy to the patient using the knowledgebase developed from the Monte Carlo simulations. Patientspecific imparted energy estimates were made from 20 chest and 20 abdominopelvic clinical CT exams. The average imparted energy was 274 ± 141 mJ and 681 ± 376 mJ for the chest and abdominopelvic exams, respectively. This method can be used to estimate the regional imparted energy and/or regional dose in chest and abdominopelvic TCM CT exams across clinical operations.

AB - Currently computed tomography (CT) dosimetry relies on CT dose index (CTDI) and size specific dose estimates (SSDE). Organ dose is a better metric of radiation burden. However, organ dose estimation requires precise knowledge of organ locations. Regional imparted energy and dose can also be used to quantify radiation burden. Estimating the imparted energy from CT exams is beneficial in that it does not require precise estimates of the organ size or location. This work investigated an automated technique for retrospectively estimating the imparted energy from chest and abdominopelvic tube current modulated (TCM) CT exams. Monte Carlo simulations of chest and abdominopelvic TCM CT examinations across various tube potentials and TCM strengths were performed on 58 adult computational extended cardiac-torso (XCAT) phantoms to develop relationships between scanned mass and imparted energy normalized by dose length product (DLP). An automated algorithm for calculating the scanned patient volume was further developed using an open source mesh generation toolbox. The scanned patient volume was then used to estimate the scanned mass accounting for diverse density within the scan region. The scanned mass and DLP from the exam were used to estimate the imparted energy to the patient using the knowledgebase developed from the Monte Carlo simulations. Patientspecific imparted energy estimates were made from 20 chest and 20 abdominopelvic clinical CT exams. The average imparted energy was 274 ± 141 mJ and 681 ± 376 mJ for the chest and abdominopelvic exams, respectively. This method can be used to estimate the regional imparted energy and/or regional dose in chest and abdominopelvic TCM CT exams across clinical operations.

KW - computed tomography

KW - patient-specific

KW - radiation risk

KW - regional dose

KW - Regional imparted energy

UR - http://www.scopus.com/inward/record.url?scp=84978792142&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84978792142&partnerID=8YFLogxK

U2 - 10.1117/12.2216413

DO - 10.1117/12.2216413

M3 - Conference contribution

AN - SCOPUS:84978792142

VL - 9783

BT - Medical Imaging 2016: Physics of Medical Imaging

PB - SPIE

ER -