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The impact of scan length on the exposure levels in 16- and 64-row multidetector computed tomography: a phantom study.
Acad Radiol. 2008 Sep; 15(9):1142-7.AR

Abstract

RATIONALE AND OBJECTIVES

Higher patient exposure levels have been reported for 64-row multidetector computed tomography (MDCT) compared to 16-row MDCT. The objective of this study was to make a thorough comparison by evaluating the impact of scan length on the exposure levels at 16-row MDCT and 64-row MDCT.

MATERIALS AND METHODS

Dose-length product (DLP) values were determined to compare exposure levels in 16- and 64-row MDCT. This phantom study does not deal with a possible reduction in image quality induced by an increase in scattered radiation in 64-row MDCT compared to 16-row MDCT.

RESULTS

The exposure levels of 64-row MDCT (scan slice thickness, 0.5 mm) are up to 18% lower than those of 16-row MDCT at slice thickness 0.5 mm when scanning an object larger than 12.3 cm. At this value, the plots of the 16- and 64-row DLP values versus scan length cross. The DLP curves of 1- and 2-mm slice thickness 16-row MDCT are in closer resemblance to those of 0.5-mm 64-row MDCT. The respective exposure levels of 1- and 2-mm slice thickness 16-row MDCT exceed those of 0.5-mm 64-row MDCT by up to 4% and 3%, with intersections of 30 and 25 cm, respectively.

CONCLUSION

Lower effective doses are obtained in 64-row MDCT compared to 16-row MDCT (0.5-mm slice thickness) provided that scan length exceeds 12.3, 30, and 25 cm, for 16-row MDCT slice thickness of 0.5, 1, and 2 mm, respectively. Reduced effective dosage in 64-row MDCT compared to 16-row MDCT has not been demonstrated before. Differences in object size may thus explain discrepancies between previous studies with regard to the exposure levels at 64-slice CT compared to 16-slice CT.

Authors+Show Affiliations

Toshiba Medical Systems Europe, Zoetermeer, The Netherlands.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

18692755

Citation

Irwan, Roy, et al. "The Impact of Scan Length On the Exposure Levels in 16- and 64-row Multidetector Computed Tomography: a Phantom Study." Academic Radiology, vol. 15, no. 9, 2008, pp. 1142-7.
Irwan R, de Vries HB, Sijens PE. The impact of scan length on the exposure levels in 16- and 64-row multidetector computed tomography: a phantom study. Acad Radiol. 2008;15(9):1142-7.
Irwan, R., de Vries, H. B., & Sijens, P. E. (2008). The impact of scan length on the exposure levels in 16- and 64-row multidetector computed tomography: a phantom study. Academic Radiology, 15(9), 1142-7. https://doi.org/10.1016/j.acra.2008.03.006
Irwan R, de Vries HB, Sijens PE. The Impact of Scan Length On the Exposure Levels in 16- and 64-row Multidetector Computed Tomography: a Phantom Study. Acad Radiol. 2008;15(9):1142-7. PubMed PMID: 18692755.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The impact of scan length on the exposure levels in 16- and 64-row multidetector computed tomography: a phantom study. AU - Irwan,Roy, AU - de Vries,Henk B K, AU - Sijens,Paul E, PY - 2008/02/15/received PY - 2008/03/07/revised PY - 2008/03/08/accepted PY - 2008/8/12/pubmed PY - 2008/12/31/medline PY - 2008/8/12/entrez SP - 1142 EP - 7 JF - Academic radiology JO - Acad Radiol VL - 15 IS - 9 N2 - RATIONALE AND OBJECTIVES: Higher patient exposure levels have been reported for 64-row multidetector computed tomography (MDCT) compared to 16-row MDCT. The objective of this study was to make a thorough comparison by evaluating the impact of scan length on the exposure levels at 16-row MDCT and 64-row MDCT. MATERIALS AND METHODS: Dose-length product (DLP) values were determined to compare exposure levels in 16- and 64-row MDCT. This phantom study does not deal with a possible reduction in image quality induced by an increase in scattered radiation in 64-row MDCT compared to 16-row MDCT. RESULTS: The exposure levels of 64-row MDCT (scan slice thickness, 0.5 mm) are up to 18% lower than those of 16-row MDCT at slice thickness 0.5 mm when scanning an object larger than 12.3 cm. At this value, the plots of the 16- and 64-row DLP values versus scan length cross. The DLP curves of 1- and 2-mm slice thickness 16-row MDCT are in closer resemblance to those of 0.5-mm 64-row MDCT. The respective exposure levels of 1- and 2-mm slice thickness 16-row MDCT exceed those of 0.5-mm 64-row MDCT by up to 4% and 3%, with intersections of 30 and 25 cm, respectively. CONCLUSION: Lower effective doses are obtained in 64-row MDCT compared to 16-row MDCT (0.5-mm slice thickness) provided that scan length exceeds 12.3, 30, and 25 cm, for 16-row MDCT slice thickness of 0.5, 1, and 2 mm, respectively. Reduced effective dosage in 64-row MDCT compared to 16-row MDCT has not been demonstrated before. Differences in object size may thus explain discrepancies between previous studies with regard to the exposure levels at 64-slice CT compared to 16-slice CT. SN - 1076-6332 UR - https://www.unboundmedicine.com/medline/citation/18692755/The_impact_of_scan_length_on_the_exposure_levels_in_16__and_64_row_multidetector_computed_tomography:_a_phantom_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1076-6332(08)00187-6 DB - PRIME DP - Unbound Medicine ER -