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Valero C, Sarno A, Cutaia C, Poli M, Isoardi P, Stasi M. On the suitability of XR-SP2 gafchromic films for dosimetry in mammography. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Papanastasiou E, Protopsaltis A, Finitsis S, Hatzidakis A, Prassopoulos P, Siountas A. Institutional Diagnostic Reference Levels and Peak Skin Doses in selected diagnostic and therapeutic interventional radiology procedures. Phys Med 2021; 89:63-71. [PMID: 34352677 DOI: 10.1016/j.ejmp.2021.07.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 07/08/2021] [Accepted: 07/20/2021] [Indexed: 02/06/2023] Open
Abstract
PURPOSE Institutional (local) Diagnostic Reference Levels for Cerebral Angiography (CA), Percutaneous Transhepatic Cholangiography (PTC), Transarterial Chemoembolization (TACE) and Percutaneous Transhepatic Biliary Drainage (PTBD) are reported in this study. MATERIALS AND METHODS Data for air kerma-area product (PKA), air kerma at the patient entrance reference point (Ka,r), fluoroscopy time (FT) and number of images (NI) as well as estimates of Peak Skin Dose (PSD) were collected for 142 patients. Therapeutic procedure complexity was also evaluated, in an attempt to incorporate it into the DRL analysis. RESULTS Local PKA DRL values were 70, 34, 189 and 54 Gy.cm2 for CA, PTC, TACE and PTBD respectively. The corresponding DRL values for Ka,r were 494, 194, 1186 and 400 mGy, for FT they were 9.2, 14.2, 27.5 and 22.9 min, for the NI they were 844, 32, 602 and 13 and for PSD they were 254, 256, 1598 and 540 mGy respectively. PKA for medium complexity PTBD procedures was 2.5 times higher than for simple procedures. For TACE, the corresponding ratio was 1.6. PSD was estimated to be roughly 50% of recorded Ka,r for procedures in the head/neck region and 10% higher than recorded Ka,r for procedures in the body region. In only 5 cases the 2 Gy dose alarm threshold for skin deterministic effects was exceeded. CONCLUSION Procedure complexity can differentiate DRLs in Interventional Radiology procedures. PSD could be deduced with reasonable accuracy from values of Ka,r that are reported in every angiography system.
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Affiliation(s)
- Emmanouil Papanastasiou
- Medical Physics Laboratory, School of Medicine, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece.
| | - Athanasios Protopsaltis
- Medical Physics Laboratory, School of Medicine, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
| | - Stefanos Finitsis
- Department of Radiology, School of Medicine, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
| | - Adam Hatzidakis
- Department of Radiology, School of Medicine, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
| | - Panos Prassopoulos
- Department of Radiology, School of Medicine, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
| | - Anastasios Siountas
- Medical Physics Laboratory, School of Medicine, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
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Calibration of Gafchromic XR-RV3 film under interventional radiology conditions. POLISH JOURNAL OF MEDICAL PHYSICS AND ENGINEERING 2021. [DOI: 10.2478/pjmpe-2021-0020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abstract
Introduction: The purpose of the study was the calibration of Gafchromic films in clinical interventional radiology conditions and the assessment of the influence of dose range, the shape of the fitting curve, and its practical application. The aim of the work was to show how practically perform calibration in a wide range of doses.
Material and methods: Gafchromic XR–RV3 films were included in the study. The calibration was performed for A and B film series separately. Doses from the range of 0 – 8 Gy were used. Film dosimeters were read out in reflective mode with a commercial flatbed scanner.
Results: Among various degrees of a polynomial function, the best fit, which fulfilled the chosen criterion of 95% agreement between measured and reconstructed doses and simple equation criterion, was observed for third-degree polynomial. The fitting curve where the dose is the function of optical density (logMPV) was demonstrated to be more precise than the fitting curve based on MPV only. To minimize the difference between dose absorbed by the film and dose reconstructed from the fitting curve below 5% it is necessary to divide the calibration range of 0 – 8 Gy into two subranges for use in interventional radiology. This difference was set at a maximum level of 3.8% and 1.9% for the lowand high-dose range, respectively. Each series of films may have a slightly different calibration curve, especially for the low dose range. A deviation of up to 36% between two batches of Gafchromic film was observed.
Conclusions: For the third-degree polynomial fitting function (one of the recommended in the literature) calibration should be done into low and high dose ranges and for each batch separately. A systematic error higher than 20% could be introduced when the fitting curve from one film batch is applied to the other film batch.
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Fum WKS, Wong JHD, Tan LK. Monte Carlo-based patient internal dosimetry in fluoroscopy-guided interventional procedures: A review. Phys Med 2021; 84:228-240. [PMID: 33849785 DOI: 10.1016/j.ejmp.2021.03.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 02/18/2021] [Accepted: 03/03/2021] [Indexed: 11/27/2022] Open
Abstract
PURPOSE This systematic review aims to understand the dose estimation approaches and their major challenges. Specifically, we focused on state-of-the-art Monte Carlo (MC) methods in fluoroscopy-guided interventional procedures. METHODS All relevant studies were identified through keyword searches in electronic databases from inception until September 2020. The searched publications were reviewed, categorised and analysed based on their respective methodology. RESULTS Hundred and one publications were identified which utilised existing MC-based applications/programs or customised MC simulations. Two outstanding challenges were identified that contribute to uncertainties in the virtual simulation reconstruction. The first challenge involves the use of anatomical models to represent individuals. Currently, phantom libraries best balance the needs of clinical practicality with those of specificity. However, mismatches of anatomical variations including body size and organ shape can create significant discrepancies in dose estimations. The second challenge is that the exact positioning of the patient relative to the beam is generally unknown. Most dose prediction models assume the patient is located centrally on the examination couch, which can lead to significant errors. CONCLUSION The continuing rise of computing power suggests a near future where MC methods become practical for routine clinical dosimetry. Dynamic, deformable phantoms help to improve patient specificity, but at present are only limited to adjustment of gross body volume. Dynamic internal organ displacement or reshaping is likely the next logical frontier. Image-based alignment is probably the most promising solution to enable this, but it must be automated to be clinically practical.
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Affiliation(s)
- Wilbur K S Fum
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia; Division of Radiological Sciences, Singapore General Hospital, Outram Rd, Singapore 169608, Singapore.
| | - Jeannie Hsiu Ding Wong
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia.
| | - Li Kuo Tan
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia.
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Colombo P, Felisi M, Riga S, Torresin A. On skin dose estimation software in interventional radiology. Phys Med 2021; 81:182-184. [DOI: 10.1016/j.ejmp.2020.12.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 12/18/2020] [Accepted: 12/20/2020] [Indexed: 12/29/2022] Open
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Järvinen J, Sierpowska J, Siiskonen T, Husso M, Järvinen H, Kiviniemi T, Rissanen TT, Lindholm C, Matikka H, Larjava HRS, Mäkelä TJ, Strengell S, Eskola M, Parviainen T, Hallinen E, Pirinen M, Kivelä A, Teräs M. CONTEMPORARY RADIATION DOSES IN INTERVENTIONAL CARDIOLOGY: A NATIONWIDE STUDY OF PATIENT SKIN DOSES IN FINLAND. RADIATION PROTECTION DOSIMETRY 2020; 188:181-190. [PMID: 31838516 DOI: 10.1093/rpd/ncz273] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 10/13/2019] [Accepted: 10/25/2019] [Indexed: 06/10/2023]
Abstract
In contemporary interventional cardiology, for typical elderly patients, the most severe radiation-related harm to patients can be considered to come from skin exposures. In this paper, maximum local skin doses in cardiological procedures are explored with Gafchromic film dosimetry. Film and reader calibrations and reading were performed at the Secondary Standards Dosimetry Laboratory of the Radiation and Nuclear Safety Authority (STUK), and data were gathered from seven hospitals in Finland. As alert levels for early transient erythema, 200 Gycm2 kerma area product (KAP) and 2000 mGy air kerma levels for transcatheter aortic valve implantations (TAVI) procedures are proposed. The largest doses were measured in TAVI (4158.8 mGy) and percutaneous coronary interventions (PCI) (941.68 mGy). Accuracies of the GE DoseWatch and Siemens CareMonitor skin dose estimates were reasonable, but more results are needed to reliably assess and validate the tools' capabilities and reliabilities. Uncertainty of the Gafchromic dosimetry was estimated as 9.1% for a calibration with seven data points and 19.3% for a calibration with five data points.
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Affiliation(s)
- Jukka Järvinen
- Department of Cardiology, Turku Heart Centre, Turku University Hospital, Turku, 20521 Finland
- Department of Radiology, Turku University Hospital, Turku, 20521 Finland
- Department of Medical Physics, Turku University Hospital, Turku, 20521 Finland
| | - Joanna Sierpowska
- Department of Radiology, Central Hospital of Northern Karelia, Joensuu, 80210 Finland
| | - Teemu Siiskonen
- STUK - Radiation and Nuclear Safety Authority, Helsinki, 00880 Finland
| | - Minna Husso
- Department of Radiology, Imaging Centre, Kuopio University Hospital, Kuopio, 70210 Finland
| | - Hannu Järvinen
- STUK - Radiation and Nuclear Safety Authority, Helsinki, 00880 Finland
| | - Tuomas Kiviniemi
- Department of Cardiology, Turku Heart Centre, Turku University Hospital, Turku, 20521 Finland
| | - Tuomas T Rissanen
- Department of Radiology, Central Hospital of Northern Karelia, Joensuu, 80210 Finland
| | - Carita Lindholm
- STUK - Radiation and Nuclear Safety Authority, Helsinki, 00880 Finland
| | - Hanna Matikka
- Department of Radiology, Imaging Centre, Kuopio University Hospital, Kuopio, 70210 Finland
| | - Heli R S Larjava
- Department of Medical Imaging, Central Finland Health Care District, Jyväskylä, 40620 Finland
| | - Timo J Mäkelä
- Division of Cardiology, Department of Internal Medicine, Oulu University Hospital, Oulu, 90220 Finland
| | - Satu Strengell
- Cardiology division, Heart and lung center, Helsinki University Hospital, Helsinki, 00029 Finland
| | - Markku Eskola
- Department of Cardiology, Heart Hospital, Tampere University Hospital, Tampere, Finland and Faculty of Medicine and Life Sciences, University of Tampere, Tampere, 33520 Finland
| | - Teuvo Parviainen
- STUK - Radiation and Nuclear Safety Authority, Helsinki, 00880 Finland
| | - Elina Hallinen
- STUK - Radiation and Nuclear Safety Authority, Helsinki, 00880 Finland
| | - Markku Pirinen
- STUK - Radiation and Nuclear Safety Authority, Helsinki, 00880 Finland
| | - Antti Kivelä
- Department of Radiology, Imaging Centre, Kuopio University Hospital, Kuopio, 70210 Finland
| | - Mika Teräs
- Department of Medical Physics, Turku University Hospital, Turku, 20521 Finland
- Institute of Biomedicine, University of Turku, Turku, 20521 Finland
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Sarno A, Andreozzi E, De Caro D, Di Meo G, Strollo AGM, Cesarelli M, Bifulco P. Real-time algorithm for Poissonian noise reduction in low-dose fluoroscopy: performance evaluation. Biomed Eng Online 2019; 18:94. [PMID: 31511017 PMCID: PMC6737613 DOI: 10.1186/s12938-019-0713-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Accepted: 08/31/2019] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND Quantum noise intrinsically limits the quality of fluoroscopic images. The lower is the X-ray dose the higher is the noise. Fluoroscopy video processing can enhance image quality and allows further patient's dose lowering. This study aims to assess the performances achieved by a Noise Variance Conditioned Average (NVCA) spatio-temporal filter for real-time denoising of fluoroscopic sequences. The filter is specifically designed for quantum noise suppression and edge preservation. It is an average filter that excludes neighborhood pixel values exceeding noise statistic limits, by means of a threshold which depends on the local noise standard deviation, to preserve the image spatial resolution. The performances were evaluated in terms of contrast-to-noise-ratio (CNR) increment, image blurring (full width of the half maximum of the line spread function) and computational time. The NVCA filter performances were compared to those achieved by simple moving average filters and the state-of-the-art video denoising block matching-4D (VBM4D) algorithm. The influence of the NVCA filter size and threshold on the final image quality was evaluated too. RESULTS For NVCA filter mask size of 5 × 5 × 5 pixels (the third dimension represents the temporal extent of the filter) and a threshold level equal to 2 times the local noise standard deviation, the NVCA filter achieved a 10% increase of the CNR with respect to the unfiltered sequence, while the VBM4D achieved a 14% increase. In the case of NVCA, the edge blurring did not depend on the speed of the moving objects; on the other hand, the spatial resolution worsened of about 2.2 times by doubling the objects speed with VBM4D. The NVCA mask size and the local noise-threshold level are critical for final image quality. The computational time of the NVCA filter was found to be just few percentages of that required for the VBM4D filter. CONCLUSIONS The NVCA filter obtained a better image quality compared to simple moving average filters, and a lower but comparable quality when compared with the VBM4D filter. The NVCA filter showed to preserve edge sharpness, in particular in the case of moving objects (performing even better than VBM4D). The simplicity of the NVCA filter and its low computational burden make this filter suitable for real-time video processing and its hardware implementation is ready to be included in future fluoroscopy devices, offering further lowering of patient's X-ray dose.
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Affiliation(s)
- A Sarno
- Università di Napoli, "Federico II", dip. di Fisica "E. Pancini" & INFN sez. di Napoli, Via Cintia, 80126, Naples, Italy.
| | - E Andreozzi
- Department of Electrical Engineering and Information Technologies, Università di Napoli "Federico II", Via Claudio, 21, 80125, Naples, Italy
- Istituti Clinici Scientifici Maugeri S.p.A.-Società Benefit, Via S. Maugeri, 4, 27100, Pavia, Italy
| | - D De Caro
- Department of Electrical Engineering and Information Technologies, Università di Napoli "Federico II", Via Claudio, 21, 80125, Naples, Italy
| | - G Di Meo
- Department of Electrical Engineering and Information Technologies, Università di Napoli "Federico II", Via Claudio, 21, 80125, Naples, Italy
| | - A G M Strollo
- Department of Electrical Engineering and Information Technologies, Università di Napoli "Federico II", Via Claudio, 21, 80125, Naples, Italy
| | - M Cesarelli
- Department of Electrical Engineering and Information Technologies, Università di Napoli "Federico II", Via Claudio, 21, 80125, Naples, Italy
- Istituti Clinici Scientifici Maugeri S.p.A.-Società Benefit, Via S. Maugeri, 4, 27100, Pavia, Italy
| | - P Bifulco
- Department of Electrical Engineering and Information Technologies, Università di Napoli "Federico II", Via Claudio, 21, 80125, Naples, Italy
- Istituti Clinici Scientifici Maugeri S.p.A.-Società Benefit, Via S. Maugeri, 4, 27100, Pavia, Italy
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