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Sarno A, Mettivier G, Bliznakova K, Hernandez AM, Boone JM, Russo P. Comparisons of glandular breast dose between digital mammography, tomosynthesis and breast CT based on anthropomorphic patient-derived breast phantoms. Phys Med 2022; 97:50-58. [PMID: 35395535 DOI: 10.1016/j.ejmp.2022.03.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/17/2022] [Accepted: 03/26/2022] [Indexed: 11/30/2022] Open
Abstract
PURPOSE To evaluate the bias to the mean glandular dose (MGD) estimates introduced by the homogeneous breast models in digital breast tomosynthesis (DBT) and to have an insight into the glandular dose distributions in 2D (digital mammography, DM) and 3D (DBT and breast dedicated CT, BCT) x-ray breast imaging by employing breast models with realistic glandular tissue distribution and organ silhouette. METHODS A Monte Carlo software for DM, DBT and BCT simulations was adopted for the evaluation of glandular dose distribution in 60 computational anthropomorphic phantoms. These computational phantoms were derived from 3D breast images acquired via a clinical BCT scanner. RESULTS g·c·s·T conversion coefficients based on homogeneous breast model led to a MGD overestimate of 18% in DBT when compared to MGD estimated via anthropomorphic phantoms; this overestimate increased up to 21% for recently computed DgNDBT conversion coefficients. The standard deviation of the glandular dose distribution in BCT resulted 60% lower than in DM and 55% lower than in DBT. The glandular dose peak - evaluated as the average value over the 5% of the gland receiving the highest dose - is 2.8 times the MGD in DM, this factor reducing to 2.6 and 1.6 in DBT and BCT, respectively. CONCLUSIONS Conventional conversion coefficients for MGD estimates based on homogeneous breast models overestimate MGD by 18%, when compared to MGD estimated via anthropomorphic phantoms. The ratio between the peak glandular dose and the MGD is 2.8 in DM. This ratio is 8% and 75% higher than in DBT and BCT, respectively.
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Affiliation(s)
- Antonio Sarno
- University of Naples Federico II, Dept. of Physics "Ettore Pancini", Naples, Italy; INFN Division of Naples, Naples, Italy.
| | - Giovanni Mettivier
- University of Naples Federico II, Dept. of Physics "Ettore Pancini", Naples, Italy; INFN Division of Naples, Naples, Italy
| | | | | | - John M Boone
- University of California Davis Medical Center, Sacramento, CA, USA
| | - Paolo Russo
- University of Naples Federico II, Dept. of Physics "Ettore Pancini", Naples, Italy; INFN Division of Naples, Naples, Italy
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di Franco F, Sarno A, Mettivier G, Hernandez A, Bliznakova K, Boone J, Russo P. GEANT4 Monte Carlo simulations for virtual clinical trials in breast X-ray imaging: Proof of concept. Phys Med 2020; 74:133-142. [DOI: 10.1016/j.ejmp.2020.05.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 05/04/2020] [Accepted: 05/14/2020] [Indexed: 12/27/2022] Open
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Hernandez AM, Becker AE, Boone JM. Updated breast CT dose coefficients (DgNCT) using patient-derived breast shapes and heterogeneous fibroglandular distributions. Med Phys 2019; 46:1455-1466. [DOI: 10.1002/mp.13391] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 12/06/2018] [Accepted: 01/02/2019] [Indexed: 12/18/2022] Open
Affiliation(s)
- Andrew M. Hernandez
- Department of Radiology; University of California Davis; Sacramento CA 95817 USA
| | - Amy E. Becker
- Department of Radiology; University of California Davis; Sacramento CA 95817 USA
- Biomedical Engineering Graduate Group; University of California Davis; Sacramento CA 95817 USA
| | - John M. Boone
- Department of Radiology; University of California Davis; Sacramento CA 95817 USA
- Biomedical Engineering; University of California Davis; Sacramento CA 9581 USA
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Sarno A, Mettivier G, Tucciariello RM, Bliznakova K, Boone JM, Sechopoulos I, Di Lillo F, Russo P. Monte Carlo evaluation of glandular dose in cone-beam X-ray computed tomography dedicated to the breast: Homogeneous and heterogeneous breast models. Phys Med 2018; 51:99-107. [DOI: 10.1016/j.ejmp.2018.05.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 05/04/2018] [Accepted: 05/23/2018] [Indexed: 12/11/2022] Open
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Mettivier G, Costa M, Lanconelli N, Ianiro A, Pugliese M, Quarto M, Russo P. Evaluation of Dose Homogeneity in Cone-Beam Breast Computed Tomography. RADIATION PROTECTION DOSIMETRY 2017; 175:473-481. [PMID: 28074018 DOI: 10.1093/rpd/ncw375] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 12/05/2016] [Indexed: 06/06/2023]
Abstract
The aim of this study is to determine, via measurements on phantoms and Monte Carlo (MC) simulations, the dose distribution of absorbed dose in a cone-beam breast computed tomography scan. The absorbed dose volume distribution was measured inside a polyethylene cylindrical phantom, simulating adipose breast tissue, using LiF:Mg,Ti thermoluminescence dosimeters. A reasonable agreement (between 2 and 8%) between the simulated and measured data was observed. The 3D distribution of absorbed dose was evaluated at 40, 60 and 80 kV in a phantom simulating a pendant breast. MC simulations indicate a significantly lower spread of volume dose than in mammography. The dose variation along the radial distance in the simulated phantoms was in the range of 4‒14%. These findings might be useful when devising models for breast imaging dose assessment that take into account the uneven distribution of the glandular mass in the breast volume.
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Affiliation(s)
- Giovanni Mettivier
- Dipartimento di Fisica 'Ettore Pancini', Università di Napoli Federico II, Napoli, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
| | - Matilde Costa
- Dipartimento di Fisica, Università di Trieste, Trieste, Italy
- Alma Mater Studiorum, Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy
| | - Nico Lanconelli
- Alma Mater Studiorum, Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Bologna, Italy
| | - Anna Ianiro
- Dipartimento di Fisica 'Ettore Pancini', Università di Napoli Federico II, Napoli, Italy
| | - Mariagabriella Pugliese
- Dipartimento di Fisica 'Ettore Pancini', Università di Napoli Federico II, Napoli, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
| | - Maria Quarto
- Dipartimento di Fisica 'Ettore Pancini', Università di Napoli Federico II, Napoli, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
| | - Paolo Russo
- Dipartimento di Fisica 'Ettore Pancini', Università di Napoli Federico II, Napoli, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
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Mettivier G, Bliznakova K, Sechopoulos I, Boone JM, Di Lillo F, Sarno A, Castriconi R, Russo P. Evaluation of the BreastSimulator software platform for breast tomography. Phys Med Biol 2017; 62:6446-6466. [PMID: 28398906 DOI: 10.1088/1361-6560/aa6ca3] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The aim of this work was the evaluation of the software BreastSimulator, a breast x-ray imaging simulation software, as a tool for the creation of 3D uncompressed breast digital models and for the simulation and the optimization of computed tomography (CT) scanners dedicated to the breast. Eight 3D digital breast phantoms were created with glandular fractions in the range 10%-35%. The models are characterised by different sizes and modelled realistic anatomical features. X-ray CT projections were simulated for a dedicated cone-beam CT scanner and reconstructed with the FDK algorithm. X-ray projection images were simulated for 5 mono-energetic (27, 32, 35, 43 and 51 keV) and 3 poly-energetic x-ray spectra typically employed in current CT scanners dedicated to the breast (49, 60, or 80 kVp). Clinical CT images acquired from two different clinical breast CT scanners were used for comparison purposes. The quantitative evaluation included calculation of the power-law exponent, β, from simulated and real breast tomograms, based on the power spectrum fitted with a function of the spatial frequency, f, of the form S(f) = α/f β . The breast models were validated by comparison against clinical breast CT and published data. We found that the calculated β coefficients were close to that of clinical CT data from a dedicated breast CT scanner and reported data in the literature. In evaluating the software package BreastSimulator to generate breast models suitable for use with breast CT imaging, we found that the breast phantoms produced with the software tool can reproduce the anatomical structure of real breasts, as evaluated by calculating the β exponent from the power spectral analysis of simulated images. As such, this research tool might contribute considerably to the further development, testing and optimisation of breast CT imaging techniques.
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Affiliation(s)
- G Mettivier
- Dipartimento di Fisica 'Ettore Pancini', Università di Napoli Federico II, and INFN Sezione di Napoli, I-80126 Napoli, Italy
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Sarno A, Masi M, Antonelli N, Di Lillo F, Mettivier G, Castriconi R, Russo P. Dose Volume Distribution in Digital Breast Tomosynthesis: A Phantom Study. IEEE TRANSACTIONS ON RADIATION AND PLASMA MEDICAL SCIENCES 2017. [DOI: 10.1109/trpms.2017.2705727] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Evaluation of the BreastSimulator Software Platform for Breast Tomography: Preliminary Results. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/978-3-319-41546-8_19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
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Fedon C, Longo F, Mettivier G, Longo R. GEANT4 for breast dosimetry: parameters optimization study. Phys Med Biol 2015; 60:N311-23. [PMID: 26267405 DOI: 10.1088/0031-9155/60/16/n311] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Weber N, Monnin P, Elandoy C, Ding S. A model-based approach of scatter dose contributions and efficiency of apron shielding for radiation protection in CT. Phys Med 2015; 31:889-896. [PMID: 26112350 DOI: 10.1016/j.ejmp.2015.06.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 06/02/2015] [Accepted: 06/05/2015] [Indexed: 11/19/2022] Open
Abstract
Given the contribution of scattered radiations to patient dose in CT, apron shielding is often used for radiation protection. In this study the efficiency of apron was assessed with a model-based approach of the contributions of the four scatter sources in CT, i.e. external scattered radiations from the tube and table, internal scatter from the patient and backscatter from the shielding. For this purpose, CTDI phantoms filled with thermoluminescent dosimeters were scanned without apron, and then with an apron at 0, 2.5 and 5 cm from the primary field. Scatter from the tube was measured separately in air. The scatter contributions were separated and mathematically modelled. The protective efficiency of the apron was low, only 1.5% in scatter dose reduction on average. The apron at 0 cm from the beam lowered the dose by 7.5% at the phantom bottom but increased the dose by 2% at the top (backscatter) and did not affect the centre. When the apron was placed at 2.5 or 5 cm, the results were intermediate to the one obtained with the shielding at 0 cm and without shielding. The apron effectiveness is finally limited to the small fraction of external scattered radiation.
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Affiliation(s)
- N Weber
- University of Applied Sciences, Haute Ecole de Santé Vaud, Av. Beaumont 21, 1011 Lausanne, Switzerland; University Hospital of Lausanne (CHUV), Rue du Bugnon 46, 1011 Lausanne, Switzerland
| | - P Monnin
- University of Applied Sciences, Haute Ecole de Santé Vaud, Av. Beaumont 21, 1011 Lausanne, Switzerland
| | - C Elandoy
- University Hospital of Lausanne (CHUV), Rue du Bugnon 46, 1011 Lausanne, Switzerland
| | - S Ding
- University of Applied Sciences, Haute Ecole de Santé Vaud, Av. Beaumont 21, 1011 Lausanne, Switzerland.
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Sarno A, Mettivier G, Russo P. Dedicated breast computed tomography: Basic aspects. Med Phys 2015; 42:2786-804. [DOI: 10.1118/1.4919441] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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