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Dose calculation accuracy of different image value to density tables for cone-beam CT planning in head & neck and pelvic localizations.
Phys Med. 2015 Mar; 31(2):146-51.PM

Abstract

PURPOSE

We aimed to identify the most accurate combination of phantom and protocol for image value to density table (IVDT) on volume-modulated arc therapy (VMAT) dose calculation based on kV-Cone-beam CT imaging, for head and neck (H&N) and pelvic localizations.

METHODS

Three phantoms (Catphan(®)600, CIRS(®)062M (inner phantom for head and outer phantom for body), and TomoTherapy(®) "Cheese" phantom) were used to create IVDT curves of CBCT systems with two different CBCT protocols (Standard-dose Head and Standard Pelvis). Hounsfield Unit (HU) time stability and repeatability for a single On-Board-Imager (OBI) and compatibility of two distinct devices were assessed with Catphan(®)600. Images from the anthropomorphic phantom CIRS ATOM(®) for both CT and CBCT modalities were used for VMAT dose calculation from different IVDT curves. Dosimetric indices from CT and CBCT imaging were compared.

RESULTS

IVDT curves from CBCT images were highly different depending on phantom used (up to 1000 HU for high densities) and protocol applied (up to 200 HU for high densities). HU time stability was verified over seven weeks. A maximum difference of 3% on the dose calculation indices studied was found between CT and CBCT VMAT dose calculation across the two localizations using appropriate IVDT curves. One IVDT curve per localization can be established with a bi-monthly verification of IVDT-CBCT.

CONCLUSIONS

The IVDT-CBCTCIRS-Head phantom with the Standard-dose Head protocol was the most accurate combination for dose calculation on H&N CBCT images. For pelvic localizations, the IVDT-CBCTCheese established with the Standard Pelvis protocol provided the best accuracy.

Authors+Show Affiliations

Department of Radiotherapy, Institut Bergonié, Comprehensive Cancer Centre, F-33000 Bordeaux, France.Department of Radiotherapy, Institut Bergonié, Comprehensive Cancer Centre, F-33000 Bordeaux, France.Department of Radiotherapy, Institut Bergonié, Comprehensive Cancer Centre, F-33000 Bordeaux, France.Department of Radiotherapy, Institut Bergonié, Comprehensive Cancer Centre, F-33000 Bordeaux, France.Department of Radiotherapy, Institut Bergonié, Comprehensive Cancer Centre, F-33000 Bordeaux, France.Department of Radiotherapy, Institut Bergonié, Comprehensive Cancer Centre, F-33000 Bordeaux, France.Department of Radiotherapy, Institut Bergonié, Comprehensive Cancer Centre, F-33000 Bordeaux, France. Electronic address: m.antoine@bordeaux.unicancer.fr.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25595131

Citation

Barateau, Anaïs, et al. "Dose Calculation Accuracy of Different Image Value to Density Tables for Cone-beam CT Planning in Head & Neck and Pelvic Localizations." Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB), vol. 31, no. 2, 2015, pp. 146-51.
Barateau A, Garlopeau C, Cugny A, et al. Dose calculation accuracy of different image value to density tables for cone-beam CT planning in head & neck and pelvic localizations. Phys Med. 2015;31(2):146-51.
Barateau, A., Garlopeau, C., Cugny, A., De Figueiredo, B. H., Dupin, C., Caron, J., & Antoine, M. (2015). Dose calculation accuracy of different image value to density tables for cone-beam CT planning in head & neck and pelvic localizations. Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB), 31(2), 146-51. https://doi.org/10.1016/j.ejmp.2014.12.007
Barateau A, et al. Dose Calculation Accuracy of Different Image Value to Density Tables for Cone-beam CT Planning in Head & Neck and Pelvic Localizations. Phys Med. 2015;31(2):146-51. PubMed PMID: 25595131.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dose calculation accuracy of different image value to density tables for cone-beam CT planning in head & neck and pelvic localizations. AU - Barateau,Anaïs, AU - Garlopeau,Christopher, AU - Cugny,Audrey, AU - De Figueiredo,Bénédicte Henriques, AU - Dupin,Charles, AU - Caron,Jérôme, AU - Antoine,Mikaël, Y1 - 2015/01/13/ PY - 2014/07/31/received PY - 2014/12/24/revised PY - 2014/12/29/accepted PY - 2015/1/18/entrez PY - 2015/1/18/pubmed PY - 2015/9/29/medline KW - Hounsfield units KW - IVDT curve KW - kV-CBCT SP - 146 EP - 51 JF - Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB) JO - Phys Med VL - 31 IS - 2 N2 - PURPOSE: We aimed to identify the most accurate combination of phantom and protocol for image value to density table (IVDT) on volume-modulated arc therapy (VMAT) dose calculation based on kV-Cone-beam CT imaging, for head and neck (H&N) and pelvic localizations. METHODS: Three phantoms (Catphan(®)600, CIRS(®)062M (inner phantom for head and outer phantom for body), and TomoTherapy(®) "Cheese" phantom) were used to create IVDT curves of CBCT systems with two different CBCT protocols (Standard-dose Head and Standard Pelvis). Hounsfield Unit (HU) time stability and repeatability for a single On-Board-Imager (OBI) and compatibility of two distinct devices were assessed with Catphan(®)600. Images from the anthropomorphic phantom CIRS ATOM(®) for both CT and CBCT modalities were used for VMAT dose calculation from different IVDT curves. Dosimetric indices from CT and CBCT imaging were compared. RESULTS: IVDT curves from CBCT images were highly different depending on phantom used (up to 1000 HU for high densities) and protocol applied (up to 200 HU for high densities). HU time stability was verified over seven weeks. A maximum difference of 3% on the dose calculation indices studied was found between CT and CBCT VMAT dose calculation across the two localizations using appropriate IVDT curves. One IVDT curve per localization can be established with a bi-monthly verification of IVDT-CBCT. CONCLUSIONS: The IVDT-CBCTCIRS-Head phantom with the Standard-dose Head protocol was the most accurate combination for dose calculation on H&N CBCT images. For pelvic localizations, the IVDT-CBCTCheese established with the Standard Pelvis protocol provided the best accuracy. SN - 1724-191X UR - https://www.unboundmedicine.com/medline/citation/25595131/Dose_calculation_accuracy_of_different_image_value_to_density_tables_for_cone_beam_CT_planning_in_head_&_neck_and_pelvic_localizations_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1120-1797(14)00672-3 DB - PRIME DP - Unbound Medicine ER -