Key comparison BIPM.RI(I)-K2 of the air-kerma standards of the ENEA-INMRI, Italy and the BIPM in low-energy x-rays

Burns, D T; Kessler, C; Roger, P; Toni, M P; Pinto, M; Bovi, M; Cappadozzi, G; Silvestri, C

doi:10.1088/0026-1394/48/1a/06010

Cited by 7 publications

(8 citation statements)

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“…The ionization chambers were calibrated with respect to the air kerma primary standard chamber for low-energy x-rays by the Department of Ionizing Radiation Metrology of the Italian National Agency for New Technologies, Energy and Environment (ENEA). 19 The whole equipment was designed to guarantee the safety of patients and operators and was strictly checked. 20…”

Section: Mammographic Equipmentmentioning

confidence: 99%

Dose and diagnostic performance comparison between phase-contrast mammography with synchrotron radiation and digital mammography: a clinical study report

et al. 2018

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Two dosimetric quantities [mean glandular dose (MGD) and entrance surface air kerma (ESAK)] and the diagnostic performance of phase-contrast mammography with synchrotron radiation (MSR) are compared to conventional digital mammography (DM). Seventy-one patients (age range, 41 to 82 years) underwent MSR after a DM examination if questionable or suspicious breast abnormalities were not clarified by ultrasonography. The MGD and the ESAK delivered in both examinations were evaluated and compared. Two on-site radiologists rated the images in consensus according to the Breast Imaging Reporting and Data System assessment categories, which were then correlated with the final diagnoses by means of statistical generalized linear models (GLMs). Receiver operating characteristic curves were also used to assess the diagnostic performance by comparing the area under the curve (AUC). An important MGD and ESAK reduction was observed in MSR due to the monoenergetic beam. In particular, an average 43% reduction was observed for the MGD and a reduction of more than 50% for the ESAK. GLM showed higher diagnostic accuracy, especially in terms of specificity, for MSR, confirmed by AUC analysis ([Formula: see text]). The study design implied that the population was characterized by a high prevalence of disease and that the radiologists, who read the DM images before referring the patient to MSR, could have been influenced in their assessments. Within these limitations, the use of synchrotron radiation with the phase-contrast technique applied to mammography showed an important dose reduction and a higher diagnostic accuracy compared with DM. These results could further encourage research on the translation of x-ray phase-contrast imaging into the clinics.

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Section: Mammographic Equipmentmentioning

confidence: 99%

Dose and diagnostic performance comparison between phase-contrast mammography with synchrotron radiation and digital mammography: a clinical study report

et al. 2018

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“…The ENEA-INMRI participated in 2011 in the BIPM.RI(I)-K2 comparison using the primary standards, being the same standards used for the mammography beams for both the ENEA-INMRI and the BIPM (Burns et al 2011). The direct comparison result for the quality 25 kV, W/Al beam, the closest in HVL to the mammography W/Mo beams, was 0.9976 (28); this result is in agreement, within the uncertainties, with the results presented in Table 9.…”

Section: Discussionmentioning

confidence: 99%

“…The BIPM air-kerma standard is described by Boutillon et al (1969); the correction factors for the mammography qualities are described by Kessler (2006) and the changes made to certain correction factors, by Burns et al (2009). A description of the ENEA-INMRI CAL02 standard can be found in the report of the direct comparison carried out at the BIPM in the W/Al low-energy x-ray beams (Burns et al 2011). The main dimensions, the measuring volume and the polarizing voltage for each standard are shown in Table 2.…”

Section: Details Of the Standardsmentioning

confidence: 99%

Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the ENEA-INMRI, Italy and the BIPM in mammography x-rays

Kessler¹,

Burns²,

Roger³

et al. 2015

Metrologia

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“…A custom dosimetric system, based on two custom-made high-precision ionization chambers placed approximately 3 m upstream from the sample, was used to define the exposure parameters. The ionization chambers measure the entrance radiation dose in terms of absolute air kerma and were calibrated by the Department of Ionizing Radiation Metrology of the Italian National Agency for New Technologies, Energy and Environment (ENEA) 40,41 . This system is used to calculate the MGD delivered to the sample throughout the tomographic acquisition.…”

Section: Methodsmentioning

confidence: 99%

Experimental optimization of the energy for breast-CT with synchrotron radiation

Oliva

Trapani

Arfelli

et al. 2020

Sci Rep

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Breast Computed Tomography (bCT) is a three-dimensional imaging technique that is raising interest among radiologists as a viable alternative to mammographic planar imaging. In X-rays imaging it would be desirable to maximize the capability of discriminating different tissues, described by the Contrast to Noise Ratio (CNR), while minimizing the dose (i.e. the radiological risk). Both dose and CNR are functions of the X-ray energy. This work aims at experimentally investigating the optimal energy that, at fixed dose, maximizes the CNR between glandular and adipose tissues. Acquisitions of both tissue-equivalent phantoms and actual breast specimens have been performed with the bCT system implemented within the Syrma-3D collaboration at the Syrmep beamline of the Elettra synchrotron (Trieste). The experimental data have been also compared with analytical simulations and the results are in agreement. The CNR is maximized at energies around 26–28 keV. These results are in line with the outcomes of a previously presented simulation study which determined an optimal energy of 28 keV for a large set of breast phantoms with different diameters and glandular fractions. Finally, a study on photon starvation has been carried out to investigate how far the dose can be reduced still having suitable images for diagnostics.

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Key comparison BIPM.RI(I)-K2 of the air-kerma standards of the ENEA-INMRI, Italy and the BIPM in low-energy x-rays

Cited by 7 publications

References 0 publications

Dose and diagnostic performance comparison between phase-contrast mammography with synchrotron radiation and digital mammography: a clinical study report

Dose and diagnostic performance comparison between phase-contrast mammography with synchrotron radiation and digital mammography: a clinical study report

Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the ENEA-INMRI, Italy and the BIPM in mammography x-rays

Experimental optimization of the energy for breast-CT with synchrotron radiation

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