Evaluation of patient effective dose of neurovascular imaging protocols for C-arm cone-beam CT

Chu Wang, Giao Nguyen, Greta Toncheva, Xianxian Jiang, Andrew Ferrell, Tony Smith, Terry Yoshizumi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

OBJECTIVE. The purpose of this study was threefold: to estimate the organ doses and effective doses (EDs) for seven neurovascular imaging protocols, to study the effect of beam collimation on ED, and to derive protocol-specific dose-area product (DAP)-to-ED conversion factors. MATERIALS AND METHODS. A cone-beam CT system was used to measure the organ doses for seven neurovascular imaging protocols. Two datasets were obtained: seven protocols without beam collimation (FOV, entire head) and four with beam collimation (FOV, from the base to the top of the skull). Measurements were performed on an adult male anthropomorphic phantom with 20 metal oxide semiconductor field-effect transistor (MOSFET) detectors placed in selected organs. The DAP values were recorded from the console. The EDs of five protocols were also estimated using Monte Carlo simulations software. The ED values were computed by multiplying measured organ doses to corresponding International Commission on Radiological Protection tissue-weighting factors. RESULTS. Without collimation, the EDs ranged from 0.16 to 1.6 mSv, and the DAP-to-ED conversion factors ranged from 0.035 to 0.076 mSv/Gy·cm2. For the four protocols investigated with beam collimation, the ED was reduced by a factor of approximately 2, and the DAP-to-ED conversion factors were reduced by approximately 30%. For the five protocols also estimated with the Monte Carlo method, the estimated EDs were in agreement (< 20% deviation) with those determined by the MOSFET method. CONCLUSION. We have estimated ED for standard adult neuroimaging protocols in a 3D rotational angiography system. Our results provide a simple means of ED estimation using DAP console readings.

Original languageEnglish (US)
Pages (from-to)1072-1077
Number of pages6
JournalAmerican Journal of Roentgenology
Volume202
Issue number5
DOIs
StatePublished - 2014
Externally publishedYes

Fingerprint

Semiconductors
Cone-Beam Computed Tomography
Oxides
Arm
Metals
Monte Carlo Method
Thromboplastin
Skull
Neuroimaging
Reading
Angiography
Software
Head
Datasets

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

Cite this

Evaluation of patient effective dose of neurovascular imaging protocols for C-arm cone-beam CT. / Wang, Chu; Nguyen, Giao; Toncheva, Greta; Jiang, Xianxian; Ferrell, Andrew; Smith, Tony; Yoshizumi, Terry.

In: American Journal of Roentgenology, Vol. 202, No. 5, 2014, p. 1072-1077.

Research output: Contribution to journalArticle

Wang, Chu ; Nguyen, Giao ; Toncheva, Greta ; Jiang, Xianxian ; Ferrell, Andrew ; Smith, Tony ; Yoshizumi, Terry. / Evaluation of patient effective dose of neurovascular imaging protocols for C-arm cone-beam CT. In: American Journal of Roentgenology. 2014 ; Vol. 202, No. 5. pp. 1072-1077.
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abstract = "OBJECTIVE. The purpose of this study was threefold: to estimate the organ doses and effective doses (EDs) for seven neurovascular imaging protocols, to study the effect of beam collimation on ED, and to derive protocol-specific dose-area product (DAP)-to-ED conversion factors. MATERIALS AND METHODS. A cone-beam CT system was used to measure the organ doses for seven neurovascular imaging protocols. Two datasets were obtained: seven protocols without beam collimation (FOV, entire head) and four with beam collimation (FOV, from the base to the top of the skull). Measurements were performed on an adult male anthropomorphic phantom with 20 metal oxide semiconductor field-effect transistor (MOSFET) detectors placed in selected organs. The DAP values were recorded from the console. The EDs of five protocols were also estimated using Monte Carlo simulations software. The ED values were computed by multiplying measured organ doses to corresponding International Commission on Radiological Protection tissue-weighting factors. RESULTS. Without collimation, the EDs ranged from 0.16 to 1.6 mSv, and the DAP-to-ED conversion factors ranged from 0.035 to 0.076 mSv/Gy·cm2. For the four protocols investigated with beam collimation, the ED was reduced by a factor of approximately 2, and the DAP-to-ED conversion factors were reduced by approximately 30{\%}. For the five protocols also estimated with the Monte Carlo method, the estimated EDs were in agreement (< 20{\%} deviation) with those determined by the MOSFET method. CONCLUSION. We have estimated ED for standard adult neuroimaging protocols in a 3D rotational angiography system. Our results provide a simple means of ED estimation using DAP console readings.",
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AU - Toncheva, Greta

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AU - Ferrell, Andrew

AU - Smith, Tony

AU - Yoshizumi, Terry

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