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Sun C, Salimi Y, Angeliki N, Boudabbous S, Zaidi H. An efficient dual-domain deep learning network for sparse-view CT reconstruction. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2024; 256:108376. [PMID: 39173481 DOI: 10.1016/j.cmpb.2024.108376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2024] [Revised: 08/02/2024] [Accepted: 08/15/2024] [Indexed: 08/24/2024]
Abstract
BACKGROUND AND OBJECTIVE We develop an efficient deep-learning based dual-domain reconstruction method for sparse-view CT reconstruction with small training parameters and comparable running time. We aim to investigate the model's capability and its clinical value by performing objective and subjective quality assessments using clinical CT projection data acquired on commercial scanners. METHODS We designed two lightweight networks, namely Sino-Net and Img-Net, to restore the projection and image signal from the DD-Net reconstructed images in the projection and image domains, respectively. The proposed network has small training parameters and comparable running time among dual-domain based reconstruction networks and is easy to train (end-to-end). We prospectively collected clinical thoraco-abdominal CT projection data acquired on a Siemens Biograph 128 Edge CT scanner to train and validate the proposed network. Further, we quantitatively evaluated the CT Hounsfield unit (HU) values on 21 organs and anatomic structures, such as the liver, aorta, and ribcage. We also analyzed the noise properties and compared the signal-to-noise ratio (SNR) and the contrast-to-noise ratio (CNR) of the reconstructed images. Besides, two radiologists conducted the subjective qualitative evaluation including the confidence and conspicuity of anatomic structures, and the overall image quality using a 1-5 likert scoring system. RESULTS Objective and subjective evaluation showed that the proposed algorithm achieves competitive results in eliminating noise and artifacts, restoring fine structure details, and recovering edges and contours of anatomic structures using 384 views (1/6 sparse rate). The proposed method exhibited good computational cost performance on clinical projection data. CONCLUSION This work presents an efficient dual-domain learning network for sparse-view CT reconstruction on raw projection data from a commercial scanner. The study also provides insights for designing an organ-based image quality assessment pipeline for sparse-view reconstruction tasks, potentially benefiting organ-specific dose reduction by sparse-view imaging.
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Affiliation(s)
- Chang Sun
- Beijing University of Posts and Telecommunications, School of Information and Communication Engineering, 100876 Beijing, China; Geneva University Hospital, Division of Nuclear Medicine and Molecular Imaging, CH-1211 Geneva, Switzerland
| | - Yazdan Salimi
- Geneva University Hospital, Division of Nuclear Medicine and Molecular Imaging, CH-1211 Geneva, Switzerland
| | - Neroladaki Angeliki
- Geneva University Hospital, Division of Radiology, CH-1211, Geneva, Switzerland
| | - Sana Boudabbous
- Geneva University Hospital, Division of Radiology, CH-1211, Geneva, Switzerland
| | - Habib Zaidi
- Geneva University Hospital, Division of Nuclear Medicine and Molecular Imaging, CH-1211 Geneva, Switzerland; Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, Netherlands; Department of Nuclear Medicine, University of Southern Denmark, Odense, Denmark; University Research and Innovation Center, Óbuda University, Budapest, Hungary.
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Dejean C, Viellard T, Caron J, Lisbona A, Moreau M. Professional ethics in the French medical physicist community: Survey results and implications. Phys Med 2024; 123:103416. [PMID: 38943800 DOI: 10.1016/j.ejmp.2024.103416] [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: 01/27/2024] [Revised: 04/29/2024] [Accepted: 06/24/2024] [Indexed: 07/01/2024] Open
Abstract
INTRODUCTION Since 2017, in France, medical physicists (MP) are finally defined by law as health professionals and as such, the roles and responsibilities of an MP lean on those medical professional ethics but MPs lack initial or continuing training in this subject. In order to find out how our colleagues feel about this subject, the following survey was conducted. METHODS French Society of Medical Physics (SFPM) designed a web survey addressed to its members and non-members concerning ethics based on the 2013 AAPM work; experience and training were highlighted as particularly important within the survey structure. RESULTS 249 answers were collected and showed a pronounced concern at the lack of initial and continuous training in this subject. Professional experience of non-ethical behaviour was attributed to the lack of training, resources or competences and hostile work environments. CONCLUSION To address the shortcomings highlighted in the survey, SFPM has created a dedicated voluntary working group aimed at producing a professional code of ethics for MP and training modules to be applied at entry level or as continuing professional development for education.
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Affiliation(s)
- Catherine Dejean
- Medical Physics Unit, Centre Antoine-Lacassagne, 06 189 Nice, France; Société Française de Physique Médicale, SFPM, 47 rue de la Colonie, 75013 Paris, France.
| | - Térence Viellard
- Department of Epidemiology, Biostatistics and Health Data, Centre Antoine-Lacassagne, 06 189 Nice, France
| | - Jérôme Caron
- Medical Physics Unit, Institut Bergonié, 33 000 Bordeaux, France
| | - Albert Lisbona
- Société Française de Physique Médicale, SFPM, 47 rue de la Colonie, 75013 Paris, France
| | - Matthieu Moreau
- Société Française de Physique Médicale, SFPM, 47 rue de la Colonie, 75013 Paris, France; Medical Physics Unit, Clinique Mutualiste de l'Estuaire, 44 606 Saint Nazaire, France
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Hu Y, Ma M, Yin H, Ren P, Tian X, Zheng Z, Zhong Z, Wang Z, Yang Z, Chen H. Assessment of cumulative cancer risk attributable to diagnostic X-ray radiation: a large cohort study. Eur Radiol 2023; 33:1769-1778. [PMID: 36370173 DOI: 10.1007/s00330-022-09178-4] [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: 11/06/2021] [Revised: 09/13/2022] [Accepted: 09/19/2022] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To assess the risk of cancer induced by diagnostic X-ray exposure in multiple radiological examinations and to explore the relevant influences to provide a reference for rational usage of X-ray examinations. METHODS Data for all adult patients who underwent X-ray examinations from August 2004 to April 2020 in a general hospital was collected, including sex, age, primary diagnosis, and X-ray examination. Based on the Biological Effects of Ionizing Radiations report, age and sex and effective dose for a single X-ray examination were used to calculate the lifetime attributable risk (LAR). Patients whose cancer LAR values were in the top 5% were considered to have a high cancer risk; the factors influencing this status were explored by using multivariate logistic regression analyses. RESULTS In total, 1,143,413 patients with 3,301,286 X-ray examinations were included. LARs of cancer incidence and death were < 0.2% and < 0.13% among 95% of patients and they were > 1% among 0.21% and 0.07% of patients. High risks of incidence and death were significantly associated with corrected exposure frequency (odds ratio [OR], 1.080 and 1.080), sex (OR, male vs. female, 0.421 and 0.372), and year of birth (OR, 1.088 and 1.054), with all p values < 0.001. Among 20 disease categories, congenital disease (OR, 3.792 and 4.024), genitourinary disease (OR, 3.608 and 3.202), digestive disease (OR, 3.247 and 3.272), and tumor disease (OR, 2.706 and 2.767) had the strongest associations with high risks of incidence and death (all p values < 0.001). CONCLUSIONS Cancer risk induced by diagnostic X-ray examinations can be considered acceptable clinically. Patients having certain diseases are potentially at a relative higher risk due to recurrent examinations. KEY POINTS • It was the first large-scale investigation of cumulative X-ray exposure in China, involving more than 3.3 million X-ray scans of all types of diagnostic X-ray examinations for about 1.1 million patients during the past 16 years. • The study revealed that the incidence risk of cancer induced by X-ray-related examinations was 0.01% on average, which was substantially lower than that of cancer induced by non-X-ray radiation. The risk could be considered acceptable clinically. • Patients having certain diseases were potentially at a relatively higher cancer risk due to recurrent X-ray examinations. The cumulative effect of X-ray exposure could not be ignored and was worthy of attention.
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Affiliation(s)
- Yanjun Hu
- School of Biomedical Engineering, Capital Medical University, No. 10, Xitoutiao, Youanmen, Fengtai District, Beijing, 100069, People's Republic of China.,Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing, 100069, People's Republic of China.,Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing, 100050, People's Republic of China
| | - Moxuan Ma
- School of Biomedical Engineering, Capital Medical University, No. 10, Xitoutiao, Youanmen, Fengtai District, Beijing, 100069, People's Republic of China.,Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing, 100069, People's Republic of China
| | - Hongxia Yin
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing, 100050, People's Republic of China
| | - Pengling Ren
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing, 100050, People's Republic of China
| | - Xin Tian
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing, 100050, People's Republic of China
| | - Zhimin Zheng
- School of Biomedical Engineering, Capital Medical University, No. 10, Xitoutiao, Youanmen, Fengtai District, Beijing, 100069, People's Republic of China.,Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing, 100069, People's Republic of China
| | - Zhaohui Zhong
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing, 100050, People's Republic of China
| | - Zhenchang Wang
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing, 100050, People's Republic of China
| | - Zhenghan Yang
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing, 100050, People's Republic of China.
| | - Hui Chen
- School of Biomedical Engineering, Capital Medical University, No. 10, Xitoutiao, Youanmen, Fengtai District, Beijing, 100069, People's Republic of China. .,Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing, 100069, People's Republic of China.
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Samara ET, Saltybaeva N, Sans Merce M, Gianolini S, Ith M. Systematic literature review on the benefit of patient protection shielding during medical X-ray imaging: Towards a discontinuation of the current practice. Phys Med 2022; 94:102-109. [PMID: 35030383 DOI: 10.1016/j.ejmp.2021.12.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 12/15/2021] [Accepted: 12/28/2021] [Indexed: 11/25/2022] Open
Abstract
PURPOSE Patient shielding during medical X-ray imaging has been increasingly criticized in the last years due to growing evidence that it often provides minimal benefit and may even compromise image quality. In Europe, and as also shown in a short assessment in Switzerland, the use of patient shielding is inhomogeneous. The aim of this study was to systematically review recent literature in order to assess benefits and appraise disadvantages related to the routine use of patient shielding. METHODS To evaluate benefits and disadvantages related to the application of patient shielding in radiological procedures, a systematic literature review was performed for CT, radiography, mammography and fluoroscopy-guided medical X-ray imaging. In addition, reports from medical physics societies and authorities of different countries were considered in the evaluation. RESULTS The literature review revealed 479 papers and reports on the topic, from which 87 qualified for closer analysis. The review considered in- and out-of-plane patient shielding as well as shielding for pregnant and pediatric patients. Dose savings and other dose and non-dose related effects of patient shielding were considered in the evaluation. CONCLUSIONS Although patient shielding has been used in radiological practice for many years, its use is no longer undisputed. The evaluation of the systematic literature review of recent studies and reports shows that dose savings are rather minimal while significant dose- and non-dose-related detrimental effects are present. Consequently, the routine usage of patient protection shielding in medical X-ray imaging can be safely discontinued for all modalities and patient groups.
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Affiliation(s)
- Eleni Theano Samara
- Radiation Protection Unit, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
| | - Natalia Saltybaeva
- Radiation Protection Unit, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Marta Sans Merce
- Department of Radiology and Medical Informatics, University of Geneva, Geneva, Switzerland
| | | | - Michael Ith
- Department of Diagnostic, Interventional and Pediatric Radiology (DIPR), Inselspital, Bern University Hospital, University of Bern, Switzerland
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Vano E. Why is radiological protection different in medicine? Sievert Memorial Lecture. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2021; 41:S128-S138. [PMID: 33971634 DOI: 10.1088/1361-6498/abffc5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 05/10/2021] [Indexed: 06/12/2023]
Abstract
There are many aspects of radiological protection in medicine that are different from other areas of activity using ionising radiation. In this paper, the author presents and justify some of these differences and highlight the reasons for and benefits of this consideration for the medical field. It is important to understand the differences as we are all likely to be patients at some point in our lives and be exposed to ionising radiation for imaging procedures several times and, in some cases, for therapeutic indications. The work done by the International Commission on Radiological Protection and other international organisations to produce and recommend a consistent system of radiological protection in medicine for the safe use of ionising radiation in medical practices must be highlighted. We should understand why we do not apply dose limits and dose constraints to patients, as well as why we have three levels of justification when considering the use of ionising radiation for patients. We highlight the relevance of personalised radiation protection in parallel to personalised medical practice, and the importance of an integrated approach for occupational and patient protection, especially for interventional procedures. We also cover the differences between patients and volunteers in biomedical research, the importance of radiation safety in quality assurance programmes (including the consideration of unintended and accidental exposures) for some clinical practices, and the relevance of education and training in radiological protection for medical and health professionals and information on radiation risks for patients. Finally, the ethical issues with regard to the safe use of ionising radiation in medicine and the impact of new technology will be addressed.
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Affiliation(s)
- Eliseo Vano
- Radiology Department, Complutense University Madrid and Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC), Madrid, Spain
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