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Chest CT performed with 3D and z-axis automatic tube current modulation technique: breast and effective doses.
Acad Radiol. 2009 Apr; 16(4):450-5.AR

Abstract

RATIONALE AND OBJECTIVES

Chest computed tomographic (CT) scans are the most effective examinations for detecting lung cancer at an early stage. In chest CT examinations, it is important to consider the reduction of radiation dose, particularly to the mammary gland. The objective of this study was to assess breast doses and effective doses on chest CT examinations between three-dimensional and z-axis automatic tube current modulation (ATCM) techniques.

MATERIALS AND METHODS

Absorbed dose to the breast, lung, mediastinum, and skin was evaluated with an anthropomorphic phantom and radiophotoluminescence glass dosimeters using two different CT scanners. The dosimeters were placed inside and outside the phantom. The phantom was scanned using three-dimensional and z-axis ATCM techniques after scanning localizer radiographs from the horizontal and vertical directions. After scanning, each organ dose was calculated. Moreover, the dose-length product recorded in the dose reports was examined, and each effective dose was calculated.

RESULTS

Compared with z-axis ATCM, three-dimensional ATCM reduced breast dose by 0.7% to 18.6% and effective dose by 4.9% to 10.2%. In particular, three-dimensional ATCM reduced frontal breast dose. For other organs, three-dimensional ATCM reduced absorbed doses by 3.4% to 13.6% compared to z-axis ATCM.

CONCLUSION

Three-dimensional ATCM can reduce absorbed doses to the breast and other organs, in addition to reducing effective dose, compared to z-axis ATCM.

Authors+Show Affiliations

Department of Quantum Medical Technology, Faculty of Health Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan. matsuk@mhs.mp.kanazawa-u.ac.jpNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article

Language

eng

PubMed ID

19268857

Citation

Matsubara, Kosuke, et al. "Chest CT Performed With 3D and Z-axis Automatic Tube Current Modulation Technique: Breast and Effective Doses." Academic Radiology, vol. 16, no. 4, 2009, pp. 450-5.
Matsubara K, Takata T, Koshida K, et al. Chest CT performed with 3D and z-axis automatic tube current modulation technique: breast and effective doses. Acad Radiol. 2009;16(4):450-5.
Matsubara, K., Takata, T., Koshida, K., Noto, K., Shimono, T., Horii, J., Yamamoto, T., & Matsui, O. (2009). Chest CT performed with 3D and z-axis automatic tube current modulation technique: breast and effective doses. Academic Radiology, 16(4), 450-5. https://doi.org/10.1016/j.acra.2008.11.005
Matsubara K, et al. Chest CT Performed With 3D and Z-axis Automatic Tube Current Modulation Technique: Breast and Effective Doses. Acad Radiol. 2009;16(4):450-5. PubMed PMID: 19268857.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Chest CT performed with 3D and z-axis automatic tube current modulation technique: breast and effective doses. AU - Matsubara,Kosuke, AU - Takata,Tadanori, AU - Koshida,Kichiro, AU - Noto,Kimiya, AU - Shimono,Tetsunori, AU - Horii,Junsei, AU - Yamamoto,Tomoyuki, AU - Matsui,Osamu, PY - 2008/09/03/received PY - 2008/11/07/revised PY - 2008/11/09/accepted PY - 2009/3/10/entrez PY - 2009/3/10/pubmed PY - 2009/5/29/medline SP - 450 EP - 5 JF - Academic radiology JO - Acad Radiol VL - 16 IS - 4 N2 - RATIONALE AND OBJECTIVES: Chest computed tomographic (CT) scans are the most effective examinations for detecting lung cancer at an early stage. In chest CT examinations, it is important to consider the reduction of radiation dose, particularly to the mammary gland. The objective of this study was to assess breast doses and effective doses on chest CT examinations between three-dimensional and z-axis automatic tube current modulation (ATCM) techniques. MATERIALS AND METHODS: Absorbed dose to the breast, lung, mediastinum, and skin was evaluated with an anthropomorphic phantom and radiophotoluminescence glass dosimeters using two different CT scanners. The dosimeters were placed inside and outside the phantom. The phantom was scanned using three-dimensional and z-axis ATCM techniques after scanning localizer radiographs from the horizontal and vertical directions. After scanning, each organ dose was calculated. Moreover, the dose-length product recorded in the dose reports was examined, and each effective dose was calculated. RESULTS: Compared with z-axis ATCM, three-dimensional ATCM reduced breast dose by 0.7% to 18.6% and effective dose by 4.9% to 10.2%. In particular, three-dimensional ATCM reduced frontal breast dose. For other organs, three-dimensional ATCM reduced absorbed doses by 3.4% to 13.6% compared to z-axis ATCM. CONCLUSION: Three-dimensional ATCM can reduce absorbed doses to the breast and other organs, in addition to reducing effective dose, compared to z-axis ATCM. SN - 1878-4046 UR - https://www.unboundmedicine.com/medline/citation/19268857/Chest_CT_performed_with_3D_and_z_axis_automatic_tube_current_modulation_technique:_breast_and_effective_doses_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1076-6332(08)00680-6 DB - PRIME DP - Unbound Medicine ER -