Characterization of mammography digital detectors
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2023
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INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th
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Recent measurements introduced in quality control protocols indicate large variations in the
evaluated parameters, pointing out as its main cause the different detectors used. The objective of this
work was to characterize, in terms of signal transfer property (STP) and noise component analysis (NCA),
five mammography digital detectors at different dose levels for a variety of beam qualities. A Carestream
EHR-M3 CR detector and Planmed Clarity, Siemens Opdima, GE Pristina and GE Crystal Nova DR
detectors were characterized in terms of STP and NCA, as a function of detector air Kerma (DAK) at the
X-ray detector input plane, in the range of 4 to 1000 µGy. A PTW Unidos E with PTW Freiburg ionization
chamber was used to measure DAK. Attenuated beam qualities (obtained by adding 2 mm Al to the
corresponding beam qualities) used were 28 kV with anode/filter combination Mo/Mo for the EHR-M3,
Opdima and Pristina detectors; 28 kV with W/Rh for the Crystal Nova; 28 kV with W/Ag for the EHR-M3
and Clarity detectors; and 34 kV with Rh/Ag for the Pristina. STP measures the relationship between the
input (DAK) and the output (pixel value) detector signals. NCA gives the fraction of total noise of each of
its components and was calculated from the variance in mean pixel value. Both parameters were
determined under stipulated (geometric and irradiation) conditions given in EUREF quality control protocol
(2013). CR detector showed a logarithmic response and DR detectors showed linear response in the tested
dose range (R² > 0.999). Response function was also influenced by the kVp and anode/filter combination
used. W/Ag and Rh/Ag beams presented higher slope and intercept for EHR-M3 and Pristina, respectively.
NCA showed that Opdima and EHR-M3 detectors are quantum limited below 270 and 900 µGy,
respectively. For higher dose values, structure noise is the dominant noise source. For the Opdima
detector, structure noise is related to the presence of wide range inhomogeneities in the data, while for CR
detectors, it is related to the phosphor grain size. All other detectors are quantum limited in the dose
range evaluated. The findings show that the signal transfer and noise characteristics are influenced by the
properties of the detection system. Moreover, STP was influenced by the beam quality.
Como referenciar
PEREZ, ALESSANDRA M.M.M.; LOPES, LAURA A.S.; CARON, RENATO F.; OLIVEIRA, BRUNO B.; CALDAS, LINDA V.E.; POLETTI, MARTIN E. Characterization of mammography digital detectors. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th, September 17-22, 2023, Viareggio, Italy. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47974. Acesso em: 17 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.