16-detector multislice CT: dosimetry estimation by TLD measurement compared with Monte Carlo simulation

A M Groves; K E Owen; H M Courtney; S J Yates; K E Goldstone; G M Blake; A K Dixon

doi:10.1259/bjr/48307881

16-detector multislice CT: dosimetry estimation by TLD measurement compared with Monte Carlo simulation

A M Groves, K E Owen, H M Courtney, S J Yates, K E Goldstone, G M Blake, A K Dixon

Biomedical Engineering Department

Research output: Contribution to journal › Article › peer-review

82 Citations (Scopus)

Abstract

Computer simulations are widely used to estimate effective doses from CT examinations. The raw data often used in their estimations were obtained some years ago and made certain assumptions regarding CT unit design. At that time multidetector CT units were unavailable. Changes in design will limit the accuracy of computer simulated dosimetry on these machines. We therefore estimated CT dose on a 16-detector unit directly using thermoluminescent dosemeters (TLDs) and an anthropomorphic phantom. We found that the dose measured directly was 18% higher than the computer simulated dosimetry, in keeping with the previously recognised underestimation by computer simulation techniques compared with TLD measurements.

Original language	English
Pages (from-to)	662 - 665
Number of pages	4
Journal	British Journal of Radiology
Volume	77
Issue number	920
DOIs	https://doi.org/10.1259/bjr/48307881
Publication status	Published - Aug 2004

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abstract = "Computer simulations are widely used to estimate effective doses from CT examinations. The raw data often used in their estimations were obtained some years ago and made certain assumptions regarding CT unit design. At that time multidetector CT units were unavailable. Changes in design will limit the accuracy of computer simulated dosimetry on these machines. We therefore estimated CT dose on a 16-detector unit directly using thermoluminescent dosemeters (TLDs) and an anthropomorphic phantom. We found that the dose measured directly was 18% higher than the computer simulated dosimetry, in keeping with the previously recognised underestimation by computer simulation techniques compared with TLD measurements.",

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AU - Goldstone, K E

AU - Blake, G M

AU - Dixon, A K

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AB - Computer simulations are widely used to estimate effective doses from CT examinations. The raw data often used in their estimations were obtained some years ago and made certain assumptions regarding CT unit design. At that time multidetector CT units were unavailable. Changes in design will limit the accuracy of computer simulated dosimetry on these machines. We therefore estimated CT dose on a 16-detector unit directly using thermoluminescent dosemeters (TLDs) and an anthropomorphic phantom. We found that the dose measured directly was 18% higher than the computer simulated dosimetry, in keeping with the previously recognised underestimation by computer simulation techniques compared with TLD measurements.

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16-detector multislice CT: dosimetry estimation by TLD measurement compared with Monte Carlo simulation

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