Kerma Profile Measurements in CT Chest Scans– a Comparison of Methodologies
The Brazilian legislation has only established
diagnostic reference levels (DRLs) in terms of Multiple Scan
Average Dose (MSAD) as a quality control parameter for computed
tomography (CT) scanners. Compliance with DRLs can be verified
by measuring the Computed Tomography Kerma Index (Ca,100) with
a pencil ionization chamber or by obtaining the kerma distribution in
CT scans with radiochromic films or rod shape lithium fluoride
termoluminescent dosimeters (TLD-100). TL dosimeters were used
to record kerma profiles and to determine MSAD values of a Bright
Speed model GE CT scanner. Measurements were done with
radiochromic films and TL dosimeters distributed in cylinders
positioned in the center and in four peripheral bores of a standard
polymethylmethacrylate (PMMA) body CT dosimetry phantom.
Irradiations were done using a protocol for adult chest. The
maximum values were found at the midpoint of the longitudinal axis.
The MSAD values obtained with three dosimetric techniques were
compared.
[1] IAEA - International Atomic Energy Agency, Dosimetry in diagnostic
radiology: an international code of practice. TRS Serie 457, Vienna,
2007.
[2] Brazil, Radiological Protection Directives for Medical and Dental
Radiodiagnostic. Portaria 453, Brasilia, DF, 1998 [in Portuguese].
[3] IAEA - International Atomic Energy Agency, International basic safety
standards for protection against ionizing radiation and for safety of
radiation sources. Safety Series, 115, Vienna, 1996.
[4] O. Rampado, E. Garelli, R. Ropolo, "Computed tomography dose
measurements with radiochromic films and a flatbed scanner," Med.
Phys., vol. 37, no. 1, Jan 2010, pp. 189-196.
[5] NIST - National Institute of Standards and Technology, At
http://www.nist.gov/pml/data/xraycoef/index.cfm. - Access 15 Sept.
2010.
[6] EC - European Commission, European guidelines on quality criteria for
computed tomography. EUR 16262 EN, Luxembourg, 1997.
[7] ISO - International Standardization Organization, ISO 12794-1:
Thermoluminescent dosimeters for extremities and eyes. Geneva, 1997.
[1] IAEA - International Atomic Energy Agency, Dosimetry in diagnostic
radiology: an international code of practice. TRS Serie 457, Vienna,
2007.
[2] Brazil, Radiological Protection Directives for Medical and Dental
Radiodiagnostic. Portaria 453, Brasilia, DF, 1998 [in Portuguese].
[3] IAEA - International Atomic Energy Agency, International basic safety
standards for protection against ionizing radiation and for safety of
radiation sources. Safety Series, 115, Vienna, 1996.
[4] O. Rampado, E. Garelli, R. Ropolo, "Computed tomography dose
measurements with radiochromic films and a flatbed scanner," Med.
Phys., vol. 37, no. 1, Jan 2010, pp. 189-196.
[5] NIST - National Institute of Standards and Technology, At
http://www.nist.gov/pml/data/xraycoef/index.cfm. - Access 15 Sept.
2010.
[6] EC - European Commission, European guidelines on quality criteria for
computed tomography. EUR 16262 EN, Luxembourg, 1997.
[7] ISO - International Standardization Organization, ISO 12794-1:
Thermoluminescent dosimeters for extremities and eyes. Geneva, 1997.
@article{"International Journal of Medical, Medicine and Health Sciences:57049", author = "Bruno B. Oliveira and Arnaldo P. Mourão and Teógenes A. da Silva", title = "Kerma Profile Measurements in CT Chest Scans– a Comparison of Methodologies", abstract = "The Brazilian legislation has only established
diagnostic reference levels (DRLs) in terms of Multiple Scan
Average Dose (MSAD) as a quality control parameter for computed
tomography (CT) scanners. Compliance with DRLs can be verified
by measuring the Computed Tomography Kerma Index (Ca,100) with
a pencil ionization chamber or by obtaining the kerma distribution in
CT scans with radiochromic films or rod shape lithium fluoride
termoluminescent dosimeters (TLD-100). TL dosimeters were used
to record kerma profiles and to determine MSAD values of a Bright
Speed model GE CT scanner. Measurements were done with
radiochromic films and TL dosimeters distributed in cylinders
positioned in the center and in four peripheral bores of a standard
polymethylmethacrylate (PMMA) body CT dosimetry phantom.
Irradiations were done using a protocol for adult chest. The
maximum values were found at the midpoint of the longitudinal axis.
The MSAD values obtained with three dosimetric techniques were
compared.", keywords = "Kerma profile, CT, MSAD, patient dosimetry", volume = "5", number = "8", pages = "319-4", }