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Pace E, Caruana CJ, Bosmans H, Cortis K, D'Anastasi M, Valentino G. An inventory of patient-image based risk/dose, image quality and body habitus/size metrics for adult abdomino-pelvic CT protocol optimisation. Phys Med 2024; 125:103434. [PMID: 39096718 DOI: 10.1016/j.ejmp.2024.103434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 07/04/2024] [Accepted: 07/17/2024] [Indexed: 08/05/2024] Open
Abstract
PURPOSE Patient-specific protocol optimisation in abdomino-pelvic Computed Tomography (CT) requires measurement of body habitus/size (BH), sensitivity-specificity (surrogates image quality (IQ) metrics) and risk (surrogates often dose quantities) (RD). This work provides an updated inventory of metrics available for each of these three categories of optimisation variables derivable directly from patient measurements or images. We consider objective IQ metrics mostly in the spatial domain (i.e., those related directly to sharpness, contrast, noise quantity/texture and perceived detectability as these are used by radiologists to assess the acceptability or otherwise of patient images in practice). MATERIALS AND METHODS The search engine used was PubMed with the search period being 2010-2024. The key words used were: 'comput* tomography', 'CT', 'abdom*', 'dose', 'risk', 'SSDE', 'image quality', 'water equivalent diameter', 'size', 'body composition', 'habit*', 'BMI', 'obes*', 'overweight'. Since BH is critical for patient specific optimisation, articles correlating RD vs BH, and IQ vs BH were reviewed. RESULTS The inventory includes 11 BH, 12 IQ and 6 RD metrics. 25 RD vs BH correlation studies and 9 IQ vs BH correlation studies were identified. 7 articles in the latter group correlated metrics from all three categories concurrently. CONCLUSIONS Protocol optimisation should be fine-tuned to the level of the individual patient and particular clinical query. This would require a judicious choice of metrics from each of the three categories. It is suggested that, for increased utility in clinical practice, more future optimisation studies be clinical task based and involve the three categories of metrics concurrently.
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Affiliation(s)
- Eric Pace
- Medical Physics, Faculty of Health Science, University of Malta, Msida MSD2080, Malta.
| | - Carmel J Caruana
- Medical Physics, Faculty of Health Science, University of Malta, Msida MSD2080, Malta
| | - Hilde Bosmans
- Medical Physics & Quality Assessment, Department of Imaging & Pathology, KU Leuven, Leuven, Belgium
| | - Kelvin Cortis
- Medical Imaging Department, Mater Dei Hospital, Msida MSD2090, Malta
| | - Melvin D'Anastasi
- Medical Imaging Department, Mater Dei Hospital, Msida MSD2090, Malta
| | - Gianluca Valentino
- Communications & Computer Engineering Department, Faculty of Information and Communication Technology, University of Malta, Msida MSD2080, Malta
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Payne S, Badawy M. Comparison of average Water Equivalent diameter values between CTContour and vendor-specific estimates in CT dosimetry. Phys Med 2023; 114:103142. [PMID: 37748357 DOI: 10.1016/j.ejmp.2023.103142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 09/13/2023] [Accepted: 09/19/2023] [Indexed: 09/27/2023] Open
Abstract
PURPOSE This study aimed to compare the average Water Equivalent Diameter (WED) values obtained from CTContour, an open-source program for Size-Specific Dose Estimate (SSDE) and WED calculation, and vendor-specific values provided by Philips scanners. METHODS A random sample of 50 adult and 50 paediatric abdomen-pelvis protocol CT images from Philips scanners were chosen at our Hospital and analysed using CTContour, and extracting average WED values from Philips from the images DICOM headers. The average WED values from the two methods were compared via Bland-Altman analysis to assess their agreement and reliability. RESULTS The average WED values obtained from CTContour were found to be slightly lower than those obtained from the vendor-specific calculations, with mean disagreements of -5.62% and -2.88% for the adult and paediatric datasets, respectively, with both methods providing clinically acceptable estimations of average WED. There was no statistically significant correlation between body habitus and the level of disagreement between methods. CONCLUSIONS This study demonstrates that CTContour can provide average WED measurements comparable to the vendor-specific calculations for SSDE and WED in CT dosimetry. Differences between programs are likely due to inherent differences in the methods employed to estimate WED automatically. Further research is warranted to validate these results for additional CT protocols beyond abdomen-pelvis studies.
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Affiliation(s)
- Shay Payne
- Diagnostic Imaging, Monash Health, Clayton, 3168 Melbourne, Australia.
| | - Mohamed Badawy
- Diagnostic Imaging, Monash Health, Clayton, 3168 Melbourne, Australia; Monash University, Clayton, 3800 Melbourne, Australia
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Cancer risk in healthy patients who underwent chest tomography comparing three different technologies. Appl Radiat Isot 2023; 193:110625. [PMID: 36680979 DOI: 10.1016/j.apradiso.2022.110625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 12/15/2022] [Accepted: 12/20/2022] [Indexed: 12/30/2022]
Abstract
This research aimed to estimate the risk of cancer associated with patients without previous disease undergoing chest tomography. Siemens CT scanners have 6, 64, and 128 detectors. The Biologic Effects of Ionizing Radiation Reports - BEIR VII methodology was used. The study presented a sample of 64 patients aged between 18 and 80 years, in the city of Belo Horizonte, Minas Gerais - Brazil. The IMPACT CT software and CalDose X CT Online were used to calculate the absorbed and equivalent dose from the Volumetric Computed Tomography Dose Index - CTDIvol (mGy) and Dose Length Product - DLP values provided by the equipment. CT-Expo Software was also used to estimate Specific Dose Estimates (SSDEs) values. The CTDvol results for the MG1, MG,2 and MG3 Diagnostic Centers in mGy were respectively 4.369 ± 1.352, 6.99 4 ± 1.53,3 and 9.984 ± 2.282 and the SSDE values were 3.800, 6.40,0 and 9,.500. The values for the equivalent dose, at the MG2 Diagnostic Center, by IMPACT CT, in (mSv) for the breasts, esophagus, heart, thyroid, lung and thymus were respectively 3.9, 5.7, 4.7, 1.0, 4.8 and 5.7. The CalDose Software, for the same equipment and the same organs, in mSv, estimated the values 7.4, 9.4, 11.1, 5.3, 10.8 and 11.3 for women and 7.1, 9.3, 11.0, 5.3, 10.2 and 10.9 for men. The estimated risk of cancer decreased according to the patient's age, but with a higher incidence for females. The use of each software must be carefully analyzed to avoid undue values due to the particularities of each one. The results also showed that the risk of developing cancer due to radiation decreases with patient age and is higher in females.
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Wang C, Lin X, Liu H, Fu J, Zhuo W, Liu H. Construction of a computational MDCT model for simulations of the detector signals. RADIATION MEDICINE AND PROTECTION 2023. [DOI: 10.1016/j.radmp.2023.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
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Estimation of effective and organ dose from chest CT. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Imai K, Takeda K, Fujii K, Kawaura C, Nishimoto T, Mori M, Yamamoto Y, Izumi T. Relationship between Dilution Magnification of Non-Ionic Iodinated Contrast Medium and Amplification Effect of Radiation Dose. JOURNAL OF NEUROENDOVASCULAR THERAPY 2022; 16:586-592. [PMID: 37502666 PMCID: PMC10370713 DOI: 10.5797/jnet.oa.2022-0041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 09/02/2022] [Indexed: 07/29/2023]
Abstract
Objective Neuroendovascular treatments are less invasive than surgical clipping. However, the number of fluoroscopy runs may be greater when a contrast medium is used than when routine angiography is performed. Several recent studies have suggested that an iodinated contrast medium causes an increase in the radiation dose. Therefore, it is clinically important to identify physical factors causing amplification of the radiation dose. The purpose of this study was to investigate how dilution of a contrast medium with water influences the amplification effect of the radiation dose using simulation analysis. Methods Three different types of commercially available contrast media, namely, iopamidol, iohexol, and iodixanol, were diluted 1.7-3.3 times with water and placed in the left brain parenchyma of a numerical brain phantom. Using the Monte Carlo simulation method, the phantom was exposed to X-ray beams under constant exposure conditions, and the energy absorbed in the entire region of the left brain parenchyma was estimated. At the same time, the content and volume of a contrast medium in the cerebral vessels were predicted on the basis of pharmacokinetic and fractal analyses. Results The increase in absorbed energy was attributed to secondary electrons emitted from the contrast medium and varied depending on its content and volume. Interestingly, the amount of energy absorbed increased with increasing dilution of the contrast medium. Furthermore, the amplification effect of the radiation dose varied according to the type of contrast medium used. Conclusion These results suggest that the amplification effect of the radiation dose is closely related to an increase in the cross-sectional area in which the X-rays interact with the contrast medium, which is caused by increased distribution of contrast medium in the cerebral vessels. When the contrast medium is diluted with water, its spread in the cerebral vessels plays a more important role than its content in the amplification effect of the radiation dose.
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Affiliation(s)
- Kuniharu Imai
- Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Kento Takeda
- Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Keisuke Fujii
- Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Chiyo Kawaura
- Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Takuya Nishimoto
- Division of Radiological Technology, Nagoya University Hospital, Nagoya, Aichi, Japan
| | - Masaki Mori
- Division of Radiological Technology, Nagoya University Hospital, Nagoya, Aichi, Japan
| | - Yuki Yamamoto
- Division of Radiological Technology, Fujita Health University Okazaki Medical Center, Nagoya, Aichi, Japan
| | - Takashi Izumi
- Department of Neurosurgery, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
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Fukunaga M, Matsubara K, Yamaguchi Y. [Organ and Effective Doses Using Automation Organ Dose Estimation Software for Lung Cancer Screening Using Low-dose Computed Tomography]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2022; 78:1176-1186. [PMID: 36058849 DOI: 10.6009/jjrt.2022-1205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
PURPOSE The purpose of this study was to evaluate the differences in the organ doses and the effective doses using three types of automated organ dose estimation software for low-dose computed tomography (CT) screening for lung cancer and to evaluate the correlations between each dose and size-specific dose estimates (SSDEs). METHODS Seventy-two adults who underwent low-dose CT screening for lung cancer were included, and the organ doses and the effective doses were calculated using each of automated organ dose estimation software. We evaluated differences between software for the organ doses and the effective doses and the correlations between each dose and SSDEs. RESULTS Differences in organ doses and effective doses were observed among the software. The organ doses showed a strong correlation (r=0.833-0.995) with SSDEs for organs within the scan range. The effective doses showed a strong correlation (r=0.830-0.970) with SSDEs, although there were significant differences among the software. CONCLUSION Although the organ doses and the effective doses differed between software, it may be possible to estimate them from SSDEs by using linear regression equations.
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Affiliation(s)
- Masaaki Fukunaga
- Department of Radiological Technology, Kurashiki Central Hospital
| | - Kosuke Matsubara
- Department of Quantum Medical Technology, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
| | - Yuki Yamaguchi
- Department of Radiological Technology, Kurashiki Central Hospital
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He J, Dong G, Deng Y, He J, Xiu Z, Feng F. Comparison of Application Value of Different Radiation Dose Evaluation Methods in Evaluating Radiation Dose of Adult Thoracic and Abdominal CT Scan. Front Surg 2022; 9:860968. [PMID: 35402481 PMCID: PMC8990916 DOI: 10.3389/fsurg.2022.860968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 02/22/2022] [Indexed: 11/13/2022] Open
Abstract
Objective To explore the differences among volumetric CT dose index (CTDIvol), body-specific dose assessment (SSDEED) based on effective diameter (ED), and SSDEWED based on water equivalent diameter (WED) in evaluating the radiation dose of adult thoracic and abdominal CT scanning. Methods From January 2021 to October 2021, enhanced chest CT scans of 100 patients and enhanced abdomen CT scans of another 100 patients were collected. According to the body mass index (BMI), they can be divided into groups A and D (BMI < 20 kg/m2), groups B and E (20 kg/m2 ≤ BMI ≤ 24.9 kg/m2), and groups C and F (BMI > 24.9 kg/m2). The CTDIvol, anteroposterior diameter (AP), and the left and rght diameter (LAT) of all the patients were recorded, and the ED, water equivalent diameter (WED), the conversion factor (f size,ED), (f size, WED), SSDEED, and SSDEWED were calculated. The differences were compared between the different groups. Results The AP, LAT, ED, and WED of groups B, E, C, and F were higher than those of groups A and D, and those of groups C and F were higher than those of groups B and E (P < 0.05). The f size,ED and f size, WED of groups B, E, C, and F are lower than those of groups A and D, and those of groups C and F are lower than those of groups B and E (P < 0.05). CTDIvol, SSDEED, and SSDEWED in groups B, E, C, and F are higher than those in groups A and D, and those in groups C and F are higher than those in groups B and E (p < 0.05). In the same group, patients with chest- and abdomen-enhanced have higher SSDEWED and SSDEED than CTDIvol, patients with chest-enhanced CT scans have higher SSDEWED than SSDEED, and patients with abdomen-enhanced CT scans have higher SSDEED than SSDEWED (P < 0.05). Conclusion CTDIvol and ED-based SSDEED underestimated the radiation dose of the subject exposed, where the patient was actually exposed to a greater dose. However, SSDEWED based on WED considers better the difference in patient size and attenuation characteristics, and can more accurately evaluate the radiation dose received by patients of different sizes during the chest and abdomen CT scan.
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Affiliation(s)
- Jimin He
- Department of Radiology, The First People's Hospital of Longquanyi District, Chengdu, China
| | - Guanwei Dong
- Department of Radiology, The First People's Hospital of Longquanyi District, Chengdu, China
| | - Yi Deng
- Department of Rehabilitation, The First People's Hospital of Longquanyi District, Chengdu, China
| | - Jun He
- Department of Radiology, The First People's Hospital of Longquanyi District, Chengdu, China
| | - ZhiGang Xiu
- Department of Radiology, The First People's Hospital of Longquanyi District, Chengdu, China
| | - Fanzi Feng
- Department of Radiology, The First People's Hospital of Longquanyi District, Chengdu, China
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Fujii K, Nomura K, Muramatsu Y, Ota H. PATIENT-SPECIFIC ORGAN DOSE EVALUATION BASED ON MONTE CARLO SIMULATION AND DOSE METRICS IN PAEDIATRIC CHEST-ABDOMEN-PELVIS CT EXAMINATIONS. RADIATION PROTECTION DOSIMETRY 2021; 197:46-53. [PMID: 34726759 DOI: 10.1093/rpd/ncab157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 10/04/2021] [Accepted: 10/07/2021] [Indexed: 06/13/2023]
Abstract
This study aimed to determine organ doses based on Monte Carlo (MC) simulations for individual paediatric patients undergoing chest-abdomen-pelvis computed tomography (CT) examinations and to evaluate correlations of organ doses with dose metrics. MC simulations were performed by inputting detailed descriptions of a CT scanner, scanning parameters and CT images of 51 paediatric patients aged from 0 to 10 years into the simulation software. Organ doses for six radiosensitive organs were determined from dose distribution images obtained as the simulation results. The correlations of organ doses with dose metrics such as volume CT dose index, size-specific dose estimates (SSDEs), and organ-specific SSDEs were evaluated from the corresponding coefficients of determination. Organ doses for ages of 0-1 and 1-5 years were 22%-32% lower than those for ages of 5-10 years. Organ doses exhibited higher linear correlations with SSDEs and organ-specific SSDEs, and can be easily estimated using the linear regression.
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Affiliation(s)
- Keisuke Fujii
- Nagoya University Graduate School of Medicine, Department of Integrated Health Sciences, 1-1-20 Daiko-Minami, Higashi-ku, Nagoya, Aichi 461-8673, Japan
- National Cancer Center Hospital East, Department of Radiological Technology, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Keiichi Nomura
- National Cancer Center Hospital East, Department of Radiological Technology, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Yoshihisa Muramatsu
- National Cancer Center Hospital East, Department of Radiological Technology, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
| | - Hiroyuki Ota
- National Cancer Center Hospital East, Department of Radiological Technology, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan
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