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Ghotra SS, Cottier Y, Bruguier C, Dominguez A, Monnin P, Sá Dos Reis C. A pilot study to identify suitable MRI protocols for preoperative planning of total hip arthroplasty. Eur J Radiol 2024; 178:111620. [PMID: 39029238 DOI: 10.1016/j.ejrad.2024.111620] [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] [Received: 10/03/2023] [Revised: 06/15/2024] [Accepted: 07/11/2024] [Indexed: 07/21/2024]
Abstract
PURPOSE The purpose of this study is to identify suitable MRI sequences and evaluate the feasibility and performance of MRI for total hip arthroplasty (THA) preoperative planning. METHOD A multicentric pilot study was conducted to evaluate DP TSE and T1 GRE 3D sequences. High-resolution pelvis, hip, knee and ankle images were acquired. Protocols were optimised to enhance image quality (IQ) and reduce acquisition time to fit clinical practice. The final protocol was validated with 19 healthy volunteers with variable BMIs at 1.5 and 3 Tesla. Visual assessment was performed by five radiographers and radiologists using the ViewDEX software. Visual Grading Analysis (VGA), Intraclass Correlation Coefficient (ICC), Prevalence-adjusted and bias-adjusted kappa (PABAK) and Visual Grading Characteristics (VGC) were performed to analyse data. RESULTS VGA scores indicated that the optimised 3D DP TSE and 3D T1 GRE sequences at 3 T, as well as 3D DP TSE sequence at 1.5 T offer adequate IQ and allow a correct visualisation of the anatomy. Overall ICC analysis was moderate to good reliability at 0.749 (95 % CI 0.69-0.79) and increased from good to excellent at 0.846 (95 % CI 0.72-0.91) for DP at 3 T. PABAK shows fair agreement at 0.25 (95 % CI 0.227-0.273). VGC analysis showed that 3D DP TSE sequences performed statistically better than 3D T1 GRE at 1.5 and 3 T (p-value ≤ 0.05). Furthermore, 3 T sequences showed a statistically better performance compared to 1.5 T (p-value ≤ 0.05). CONCLUSIONS According to the results, 3D DP and T1 MRI sequences can be considered for preoperative planning for THA. Further research is required to emphasize the clinical validation of the results.
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Affiliation(s)
- Switinder Singh Ghotra
- School of Health Sciences (HESAV), University of Applied Sciences and Arts Western Switzerland (HES-SO), Lausanne 1011, Switzerland; Department of Radiology, Hospital of Yverdon-les-Bains (eHnv), 1400 Yverdon-les-Bains, Switzerland.
| | - Yann Cottier
- Centre d'Imagerie Diagnostique de Lausanne, Lausanne 1011, Switzerland
| | - Christine Bruguier
- Department of Diagnostic & Interventional Radiology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne 1011, Switzerland; University Center of Legal Medicine Lausanne - Geneva, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne 1011, Switzerland.
| | - Alejandro Dominguez
- School of Health Sciences (HESAV), University of Applied Sciences and Arts Western Switzerland (HES-SO), Lausanne 1011, Switzerland; University Center of Legal Medicine Lausanne - Geneva, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne 1011, Switzerland.
| | - Pascal Monnin
- School of Health Sciences (HESAV), University of Applied Sciences and Arts Western Switzerland (HES-SO), Lausanne 1011, Switzerland.
| | - Cláudia Sá Dos Reis
- School of Health Sciences (HESAV), University of Applied Sciences and Arts Western Switzerland (HES-SO), Lausanne 1011, Switzerland.
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Ludewig E, Rowan C, Schieder K, Frank B. An Overview of Factors Affecting Exposure Level in Digital Detector Systems and their Relevance in Constructing Exposure Tables in Equine Digital Radiography. J Equine Vet Sci 2023; 121:104206. [PMID: 36621702 DOI: 10.1016/j.jevs.2022.104206] [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: 03/06/2022] [Revised: 12/23/2022] [Accepted: 12/26/2022] [Indexed: 01/07/2023]
Abstract
The aim of this review is to describe the steps of constructing exposure tables for use of digital detector systems (DRx) in equine practice. Introductory, selected underlying technical aspects of digital radiography are illustrated. Unlike screen-film radiography (SFR), DRx have a uniform signal response of the detector over a large dose range. This enables generation of diagnostic images from exposures that were previously nondiagnostic on SFR, thus reducing retakes. However, with decreasing detector entrance dose, image noise increasingly hampers the image quality. Conversely, unlike the blackening observed on SFR, overexposures can go visibly undetected by the observer. In DRx the numeric exposure indicator value is the only dose-control tool. In digital radiography the challenge is to reduce the dose and reduce the radiation risk to staff whilst maintaining diagnostic image quality. We provide a stepwise method of developing exposure tables as tools for controlling exposure levels. The identified kVp - mAs combinations in the table are derived from the predefined exposure indicator values of the detector system. Further recommendations are given as to how the exposure indicator can be integrated into routine workflow for rechecking the reliability of the formerly identified settings and how these tables might serve a basis for further reduction of the exposure level. Detector quantum efficiency (DQE) is an important parameter of assessing performance of an imaging system. Detectors with higher DQE can generate diagnostic images with a lower dose, thus having a greater potential for dose reduction than detectors with low DQE.
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Affiliation(s)
- Eberhard Ludewig
- Diagnostic Imaging, Department of Small Animals and Horses, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Conor Rowan
- Diagnostic Imaging, Department of Small Animals and Horses, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Katrin Schieder
- Diagnostic Imaging, Department of Small Animals and Horses, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Ben Frank
- Diagnostic Imaging, Department of Small Animals and Horses, University of Veterinary Medicine Vienna, Vienna, Austria
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Sayed M, Knapp KM, Fulford J, Heales C, Alqahtani SJ. The principles and effectiveness of X-ray scatter correction software for diagnostic X-ray imaging: A scoping review. Eur J Radiol 2023; 158:110600. [PMID: 36444818 DOI: 10.1016/j.ejrad.2022.110600] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 10/17/2022] [Accepted: 11/06/2022] [Indexed: 11/18/2022]
Abstract
PURPOSE An anti-scatter grid is often used in X-ray radiography to reduce the scattered X-rays generated from the patient. However, the presence of a grid means the patient dose subsequently increases. Recently,severalmanufacturers have developedsoftwarethat is capable of correctingfor scattered X-rays withouttheuse ofa conventional grid. This scoping review aims to systematically map the research assessing scattering correction software and to identify any existing knowledge gaps. METHODS This scoping review involved conducting a systematic search in PubMed, Scopus, and Web of science to reveal studies that were relevant to the research question. Articles published between 01.01.2000 and 31.12.2021 examining X-ray scatter correction software for X-ray imaging were included. A part of the PRISMA model and PICO framework were utilised to establish eligibility criteria. A structured summary table was utilised to extract data from the selected articles. RESULTS In this scoping review, 20 years of literature in X-ray conventional radiography. 11 articles were included in the data synthesis. The study populations of the included studies were varied: patients, image quality phantoms and anatomical phantoms. The clinical applications of X-ray scatter correction software were found to be limited to specific body parts (cervical spine, chest, shoulder, lumbar spine, hip and pelvis). The scatter correction software appears to be effective in terms of image quality and in reducing the radiation dose. However, the conventional grid still provides a higher image quality. CONCLUSIONS X-ray scatter correction software can be effective and provides potentialbenefits for some circumstances or clinical scenarios.
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Affiliation(s)
- Mohammad Sayed
- Diagnostic Radiology Department, College of Applied Medical Sciences, Najran University, Najran 61441, Saudi Arabia; Department of Medical Imaging, College of Medicine and Health, University of Exeter, St Luke's Campus, Heavitree Road, Exeter EX1 2LU, UK.
| | - Karen M Knapp
- Department of Medical Imaging, College of Medicine and Health, University of Exeter, St Luke's Campus, Heavitree Road, Exeter EX1 2LU, UK.
| | - Jon Fulford
- Medical School, University of Exeter, Medical School Building, St Luke's Campus, Magdalen Road, Exeter EX1 2LU, UK.
| | - Christine Heales
- Department of Medical Imaging, College of Medicine and Health, University of Exeter, St Luke's Campus, Heavitree Road, Exeter EX1 2LU, UK.
| | - Saeed J Alqahtani
- Diagnostic Radiology Department, College of Applied Medical Sciences, Najran University, Najran 61441, Saudi Arabia.
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Kristensen SV, Outzen C, Grau LM, Larsen TR, Bidstrup M, Egeskjold MV, Knude JA, Juhl D, Precht H. Can advanced edge enhancement software improve image quality to visualise tubes, catheters and wires in digital chest radiographs? Radiography (Lond) 2023; 29:165-170. [PMID: 36395686 DOI: 10.1016/j.radi.2022.10.012] [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: 05/22/2022] [Revised: 10/16/2022] [Accepted: 10/18/2022] [Indexed: 11/15/2022]
Abstract
INTRODUCTION This study aimed to test whether Advanced Edge Enhancement (AEE) software could improve the localisation of tubes, catheters or wires, while also affecting the overall image quality in chest x-rays (CXR). METHODS In total, 50 retrospective CXRs were included. All images were obtained utilising the Canon X-ray system (CANON/Arcoma Precision T3 DR System, Canon Europe, Amsterdam, NL) with a CXDI-810C wireless detector. A clinical image, plus three additional AEE algorithms were applied using post processing (two intensity variations 1 and 4) on all CXRs totalling 350 different images. Three radiologists evaluated the images using a subjective Absolute Visual Grading Analysis (VGA). The clinical images used in post processing were not applied as reference in the analysis. Each radiologist graded the images separately in a randomized order, with a score of three indicating suitability for diagnostic assessment. RESULTS The three AEE algorithms contributed to an overall improvement (average 16-49%) in visualisation of tube, catheter or wire on CXR images. The Mann-Whitney U tests showed a statistically significant (p < 0.05) improvement in contrast resolution and sharpness, indicating an increased ability to differentiate tubes, wires or catheters tips from surrounding tissues. For the noise criterion, not applying any AEE algorithm showed a significantly higher homogeneity in soft tissue (p < 0.001), reducing the ability to visualise soft tissue. The high-intensity catheter algorithm was the only algorithm to achieve a statistically significant (p = 0.017) increase in the ability to differentiate pulmonary tissues of similar density. CONCLUSION An overall improvement in the visualisation of tube, catheter and wire placement was obtained using the three AEE-algorithms. The bone and catheter algorithms showed the highest consistency, with the small structure algorithm underperforming in resolution and low contrast resolution. In general, image noise increased regardless of algorithm type or applied intensity. The AEE-algorithms should therefore be seen as a supplementary tool to the clinical image protocol, while having the potential to improve image quality to specific clinical situations. IMPLICATIONS FOR PRACTICE AEE filtered images appear to be a supplement to the current practice of using CXRs in the diagnosis in placement of catheters, tubes and wires in the chest region. The use of AEE-algorithms has the potential to improve the daily work in clinical practice, which serves the basis for further investigation of its effect on radiographic practices.
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Affiliation(s)
- S V Kristensen
- School of Radiography, University College Lillebaelt, Odense, Denmark.
| | - C Outzen
- School of Radiography, University College Lillebaelt, Odense, Denmark
| | - L M Grau
- Department of Radiology, Hospital Sonderjylland, University Hospitals of Southern Denmark, Sønderborg, Denmark
| | - T R Larsen
- School of Radiography, University College Lillebaelt, Odense, Denmark
| | - M Bidstrup
- School of Radiography, University College Lillebaelt, Odense, Denmark
| | - M V Egeskjold
- School of Radiography, University College Lillebaelt, Odense, Denmark
| | - J A Knude
- School of Radiography, University College Lillebaelt, Odense, Denmark
| | - D Juhl
- Department of Radiology, Hospital Sonderjylland, University Hospitals of Southern Denmark, Sønderborg, Denmark
| | - H Precht
- School of Radiography, University College Lillebaelt, Odense, Denmark; Health Sciences Research Centre, UCL University College, Odense, Denmark; Department of Regional Health Research, University of Southern Denmark; Department of Radiology, Kolding, Lillebaelt Hospital, University Hospitals of Southern Denmark, Denmark
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Radiation dose reduction for chest radiography of infants in intensive care units using a high peak kilovoltage-technique. Pediatr Radiol 2022; 52:874-882. [PMID: 35106646 DOI: 10.1007/s00247-021-05262-x] [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: 04/06/2021] [Revised: 10/24/2021] [Accepted: 12/04/2021] [Indexed: 10/19/2022]
Abstract
BACKGROUND Chest radiography is an important tool in the care of infants in intensive care units. Image optimization must be monitored to minimize radiation exposure in this susceptible population. OBJECTIVE To examine the use of a high tube peak kilovoltage technique to achieve radiation dose reduction while maintaining adequate image quality. MATERIALS AND METHODS A retrospective study was conducted. Radiation doses of chest radiographs performed in the pediatric intensive care units in our institution were calculated. The radiographs were divided into two groups based on the value of the peak kilovoltage used: above and below 60 kilovolts (kV). Image quality was blindly assessed by two fellowship-trained pediatric radiologists. Air kerma, effective dose and quality score for the high versus the low peak kilovoltage group were compared and analyzed. RESULTS The study included 376 radiographs. One hundred and seven radiographs were performed using peak kilovoltage values equal to or above 60 kV and 269 radiographs were performed using values under 60 kV. The average air kerma for the lower peak kilovoltage group was 56.6 microgray (µGy) (30.7-81.9) vs. 22.9 µGy (11.8-34.4) for the higher peak kilovoltage group (P<0.0001). The mean difference in effective dose between the groups was 11.68 (P<0.0001). The mean difference for the quality score was 0.06 (±0.03, P=0.10), not statistically significant. CONCLUSION A high peak kilovoltage technique may enable a statistically significant radiation dose reduction without compromising the diagnostic value of the image.
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Advances in multiscale image processing and its effects on image quality in skeletal radiography. Sci Rep 2022; 12:4726. [PMID: 35304544 PMCID: PMC8933435 DOI: 10.1038/s41598-022-08699-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 03/09/2022] [Indexed: 11/08/2022] Open
Abstract
Multi-frequency processing (MFP) leads to enhanced image quality (IQ) of radiographs. This study is to determine the effect of third generation MFP (M3) on IQ in comparison to standard second-generation MFP (M2). 20 cadavers were examined and post-processing of radiographs was performed with both M2 and M3. Three readers blinded to the MFP used for each image independently compared corresponding image pairs according to overall IQ and depiction of bony structures and soft tissue (+ 2: notably better > 0: equal > - 2: notably worse). A significant deviation of the median grade from grade 0 (equal) (p < 0.01) for each evaluator A, B and C speaks against an equal image quality of M2- and M3-images. M3-images were categorized with better grades (+ 1, + 2) in 87.7% for overall image quality, in 90.4% for soft tissue and 81.8% for bony structures. M3 images showed significant higher averaged SNR and CNR for all investigated lower extremities than that of M2 images (0.031 < p < 0.049). The newest generation of MFP leads to significantly better depiction of anatomical structures and overall image quality than in images processed with the preceding generation of MFP. This provides increased diagnostic accuracy and further decreased radiation exposure.
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Boënnec R, Dujardin PA, Meunier B, Rafin JM, Sirinelli D, Brunereau L, Morel B. REDUCING PELVIS RADIOGRAPH EXPOSURE IN CHILDREN USING A DOSE SIMULATION X-RAY RESEARCH SOFTWARE. RADIATION PROTECTION DOSIMETRY 2021; 194:90-96. [PMID: 34109408 DOI: 10.1093/rpd/ncab083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 03/09/2021] [Accepted: 05/07/2021] [Indexed: 06/12/2023]
Abstract
Pelvis radiography is a frequent X-ray examination. The objective of our study was to determine the minimum dose to be delivered without reducing the quality. We included 60 children having a pelvis X-ray in four groups that were equally represented by weight ranges. A software simulated, for each radiograph, six additional simulated photonic noise images corresponding to 100, 80, 64, 50, 40 and 32% of the initial dose. The 360 radiographs were blindly scored by two radiologists using a semi-quantitative Likert scale. There was no significant difference in scoring between the reference radiograph and simulated radiographs at 80% of the dose in children between 0 and 15 kg and over 35 kg. Inter-observer reproducibility was moderate to very good. Pelvis X-ray doses might be reduced by 20% in children in our institution. Software that produces simulated X-ray with decreasing dose might be a useful tool for an optimization process.
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Affiliation(s)
- Ronan Boënnec
- Pediatric Radiology Department, Clocheville Hospital, CHRU of Tours, Tours 37000, France
| | | | - Benjamin Meunier
- Pediatric Radiology Department, Clocheville Hospital, CHRU of Tours, Tours 37000, France
| | - Jean-Michel Rafin
- Pediatric Radiology Department, Clocheville Hospital, CHRU of Tours, Tours 37000, France
| | - Dominique Sirinelli
- Pediatric Radiology Department, Clocheville Hospital, CHRU of Tours, Tours 37000, France
| | - Laurent Brunereau
- Radiology Department, Trousseau Hospital, CHRU of Tours, Tours 37000, France
| | - Baptiste Morel
- Pediatric Radiology Department, Clocheville Hospital, CHRU of Tours, Tours 37000, France
- UMR 1253, iBrain, Université de Tours, Inserm, Tours 37000, France
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Evaluation of the image quality and dose reduction in digital radiography with an advanced spatial noise reduction algorithm in pediatric patients. Eur Radiol 2021; 31:8937-8946. [PMID: 34041570 DOI: 10.1007/s00330-021-07942-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 03/06/2021] [Accepted: 03/25/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVES To evaluate whether the advanced spatial noise reduction (ASNR) algorithm installed in a digital radiography system generates acceptable images at a lower dose than a conventional denoising algorithm in pediatric patients. METHODS Nine sets of 30 images of pediatric patients, classified under three protocols and three age groups, were retrospectively selected. Different levels of low-dose image sets of these 270 images were generated by a noise simulation tool after validation testing using phantoms. Each image set was obtained with both the ASNR and conventional algorithm, and grouped randomly and blinded. Three experienced pediatric radiologists were asked to pick the "image with optimum dose" among images of different dose levels with an ALARA (as low as reasonably achievable) perspective. Dose reduction rates for each protocol and age group were calculated, and entrance skin exposure (ESE) was calculated using the values of kVp and mAs, assuming a standard body depth for each age group. RESULTS With the ASNR algorithm, estimated dose reduction rates were highest for abdominal radiographs (45.0%, 27.3%, and 24.3% in infants, children, and adolescents, respectively, p < 0.001). The mean dose reductions for all age groups in the abdominal, chest, and skull radiographs were 32.8%, 12.9%, and 23.2%, respectively (p < 0.001). Average of the calculated ESE was lower with the ASNR algorithm than with the conventional algorithm group (p < 0.001). CONCLUSIONS The ASNR algorithm facilitated optimization of image quality with a higher reduction in radiation dose than the conventional algorithm, making it more acceptable for use in pediatric patients. KEY POINTS •ASNR algorithm in DR system improves image quality via enhanced contrast and noise removal by estimating actual noise distribution based on a multi-scale noise covariance and frequency processing. •Noise simulation tool (NST) generating images of different dose levels can be used for evaluation of the optimum dose without unnecessary additional radiation exposure to pediatric patients. •Retrospective clinical study using NST showed that the ASNR algorithm enabled a higher reduction in radiation dose than the conventional algorithm in pediatric patients.
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Meunier B, Boënnec R, Dujardin PA, Rafin JM, Sirinelli D, Chassagnon G, Morel B. A Dose Simulation X-Ray Software: An Innovating Tool to Reduce Chest Radiograph Exposure in Children. J Thorac Imaging 2021; 36:37-42. [PMID: 32453279 DOI: 10.1097/rti.0000000000000536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE Chest radiography is one of the most frequent x-ray examinations performed on children. Reducing the delivered dose is always a major task. The objective of our study was to determine the minimum dose to be delivered while maintaining the image quality of chest radiographs, using dose reduction simulation software. MATERIALS AND METHODS We included 60 children who had had a chest radiography in 5 groups established according to the diagnostic reference levels equitably represented by weight ranges. The software simulated for each radiograph 6 additional simulated photonic noise images corresponding to 100%, 80%, 64%, 50%, 40%, and 32% of the initial dose. The 360 radiographs were blindly scored by 2 radiologists, according to the 7 European quality criteria and a subjective criterion of interpretability, using a semiquantitative visual Lickert scale. RESULTS There was no significant difference in scoring between the reference radiograph (100%) and simulated radiographs at 80% of the dose in children between 5 and 20 kg, 50% of the dose in children between 20 and 30 kg, and between simulated radiographs at 40% of the dose in children over 30 kg. Interobserver reproducibility was moderate to excellent. CONCLUSION Chest radiography dose might be reduced by 20% in children between 5 and 20 kg, 50% in children between 20 and 30 kg, and 60% in children over 30 kg, without any difference in the image quality appreciation. Software that produced simulated x-ray with decreasing delivered dose is an innovating tool for an optimization process.
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Affiliation(s)
- Benjamin Meunier
- Pediatric Radiology Department, Clocheville Hospital, CHRU of Tours
| | - Ronan Boënnec
- Pediatric Radiology Department, Clocheville Hospital, CHRU of Tours
| | | | - Jean M Rafin
- Pediatric Radiology Department, Clocheville Hospital, CHRU of Tours
| | | | - Guillaume Chassagnon
- Radiology Department, Groupe Hospitalier Cochin-Hôtel Dieu, AP-HP, Université Paris Descartes, Paris, France
| | - Baptiste Morel
- Pediatric Radiology Department, Clocheville Hospital, CHRU of Tours
- UMR 1253, iBrain, Université de Tours, Inserm, Tours
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Kang H, Lee ES, Park HJ, Park BK, Park JY, Suh SW. Abdominal Digital Radiography with a Novel Post-Processing Technique: Phantom and Patient Studies. JOURNAL OF THE KOREAN SOCIETY OF RADIOLOGY 2020; 81:920-932. [PMID: 36238179 PMCID: PMC9432201 DOI: 10.3348/jksr.2020.81.4.920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Revised: 10/09/2019] [Accepted: 10/18/2019] [Indexed: 11/15/2022]
Abstract
Purpose Materials and Methods Results Conclusion
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Affiliation(s)
- Hyein Kang
- Department of Radiology, Chung-Ang University Hospital, Seoul, Korea
| | - Eun Sun Lee
- Department of Radiology, Chung-Ang University Hospital, Seoul, Korea
- College of Medicine, Chung-Ang University, Seoul, Korea
| | - Hyun Jeong Park
- Department of Radiology, Chung-Ang University Hospital, Seoul, Korea
- College of Medicine, Chung-Ang University, Seoul, Korea
| | - Byung Kwan Park
- College of Medicine, Chung-Ang University, Seoul, Korea
- Department of Surgery, Chung-Ang University Hospital, Seoul, Korea
| | - Jae Yong Park
- College of Medicine, Chung-Ang University, Seoul, Korea
- Department of Internal Medicine, Chung-Ang University Hospital, Seoul, Korea
| | - Suk-Won Suh
- College of Medicine, Chung-Ang University, Seoul, Korea
- Department of Surgery, Chung-Ang University Hospital, Seoul, Korea
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Precht H, Hansen DL, Ring-Pedersen BM, Møller Hansen LF, Waaler D, Tingberg A, Midtgaard M, Jensen Ohlsen MG, Juhl Hankelbjerg ST, Ravn P, Jensen IE, Christensen JK, Blackburn Andersen PA. Comparison of image quality in chest, hip and pelvis examinations between mobile equipment in nursing homes and static indirect radiography equipment in the hospital. Radiography (Lond) 2019; 26:e31-e37. [PMID: 32052778 DOI: 10.1016/j.radi.2019.10.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 10/07/2019] [Accepted: 10/08/2019] [Indexed: 10/25/2022]
Abstract
INTRODUCTION A hospital environment can be a significant burden and a health risk especially for dementia patients. Mobile x-ray equipment (ME) is used to enable imaging of these patients at home. The aim was to compare image quality (IQ) of chest, hip and pelvis images from ME to the stationary equipment (SE) used in a hospital department. METHODS We analysed examinations of the chest (n = 20), hip (n = 64) and pelvis (n = 32). Images were equally obtained from each setting of ME and SE. All images were graded using Visual Grading Analysis (VGA) by three radiographers (hip and pelvis) and three radiologists (chest). Technical IQ assessment was done by 80 additional images of a Contrast-Detail Radiography phantom (CDRAD). RESULTS All chest images were approved for diagnostic use, as well as the hip AP and pelvis images from SE. 'Approved proportion of ME images was for HIP antero-posterior (AP) and pelvis, 78% [95% CI: 52-94%] and 81% [95% CI: 54-96%] respectively. Hip axial had an overall low, but not significant different approval rate. Ordered logistic regression indicated higher IQ of HIP AP and pelvic images from SE. This contrasts that the CDRAD substudy indicated better IQ, expressed as IQFinv, from ME. CONCLUSION The VGA showed higher IQ for the SE system, while the CDRAD showed higher IQ for the ME system. IMPLICATIONS FOR PRACTICE Dementia patients can be examined at their home if the acquisition is optimised according to image quality in conjunct to radiation dose. Performing imaging out of the hospital and coordinating the patients' further treatment are new work areas for radiographers and requires excellent communication skills.
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Affiliation(s)
- H Precht
- Conrad Research Program, Health Sciences Research Centre, UCL University College, Niels Bohrs Allé 1, 5230, Odense M, Denmark; Medical Research Department, Odense University Hospital, Svendborg, Denmark; Department of Clinical Research, University of Southern, Denmark.
| | - D L Hansen
- Department of Haematology, Odense University Hospital, Denmark; Department of Clinical Research, University of Southern Denmark, Denmark
| | - B M Ring-Pedersen
- Conrad Research Program, Health Sciences Research Centre, UCL University College, Niels Bohrs Allé 1, 5230, Odense M, Denmark; Department of Radiology, Hospital Little Belt Kolding, Denmark
| | - L F Møller Hansen
- Conrad Research Program, Health Sciences Research Centre, UCL University College, Niels Bohrs Allé 1, 5230, Odense M, Denmark; Department of Radiology, Hospital Little Belt Kolding, Denmark
| | - D Waaler
- Department of Health Sciences, Norwegian University of Science and Technology, Gjøvik, Norway
| | - A Tingberg
- Department of Translational Medicine, Medical Radiation Physics, Lund University, Skåne University Hospital Malmö, Malmö, Sweden
| | - M Midtgaard
- Department of Radiology, Hospital Little Belt Kolding, Denmark
| | | | | | - P Ravn
- Department of Radiology, Hospital Little Belt Kolding, Denmark
| | - I E Jensen
- Department of Radiology, Hospital Little Belt Kolding, Denmark
| | - J K Christensen
- Department of Radiology, Hospital Little Belt Kolding, Denmark
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Precht H, Waaler D, Outzen C, Brock Thorsen J, Steen T, Hellfritzsch M, Aagesen H, Holst A, Le P, Lindequist S, Rasmussen L, Tingberg A. Does software optimization influence the radiologists' perception in low dose paediatric pelvic examinations? Radiography (Lond) 2019; 25:143-147. [DOI: 10.1016/j.radi.2018.12.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 12/10/2018] [Accepted: 12/17/2018] [Indexed: 11/17/2022]
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Davidson R, Alsleem H, Floor M, van der Burght R. A new image quality measure in CT: Feasibility of a contrast-detail measurement method. Radiography (Lond) 2016. [DOI: 10.1016/j.radi.2016.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Precht H, Tingberg A, Waaler D, Outzen CB. New developed DR detector performs radiographs of hand, pelvic and premature chest anatomies at a lower radiation dose and/or a higher image quality. J Digit Imaging 2014; 27:68-76. [PMID: 24221693 DOI: 10.1007/s10278-013-9635-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
A newly developed Digital Radiography (DR) detector has smaller pixel size and higher fill factor than earlier detector models. These technical advantages should theoretically lead to higher sensitivity and higher spatial resolution, thus making dose reduction possible without scarifying image quality compared to previous DR detector versions. To examine whether the newly developed Canon CXDI-70C DR detector provides an improved image quality and/or allows for dose reductions in hand and pelvic bone examinations as well as premature chest examinations, compared to the previous (CXDI-55C) DR detector version. A total of 450 images of a technical Contrast-Detail phantom were imaged on a DR system employing various kVp and mAs settings, providing an objective image quality assessment. In addition, 450 images of anthropomorphic phantoms were taken and analyzed by three specialized radiologists using Visual Grading Analysis (VGA). The results from the technical phantom studies showed that the image quality expressed as IQFINV values was on average approximately 45 % higher with the CXDI-70C detector compared to the CXDI-55C detector. Consistently, the VGA results from the anatomical phantom studies indicated that by using the CXDI-70C detector, diagnostic image quality could be maintained at a dose reduction of in average 30 %, depending on anatomy and kVp level. This indicates that the CXDI-70C detector is significantly more sensitive than the previous model, and supports a better clinical image quality. By using the newly developed DR detector a significant dose reduction is possible while maintaining image quality.
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Affiliation(s)
- Helle Precht
- Conrad Research Center, University College Lillebelt, Blangstedgårdsvej 4, 5220, Odense SØ, Denmark,
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Knight SP. A paediatric X-ray exposure chart. J Med Radiat Sci 2014; 61:191-201. [PMID: 26229655 PMCID: PMC4175850 DOI: 10.1002/jmrs.56] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 04/29/2014] [Accepted: 05/01/2014] [Indexed: 11/10/2022] Open
Abstract
The aim of this review was to develop a radiographic optimisation strategy to make use of digital radiography (DR) and needle phosphor computerised radiography (CR) detectors, in order to lower radiation dose and improve image quality for paediatrics. This review was based on evidence-based practice, of which a component was a review of the relevant literature. The resulting exposure chart was developed with two distinct groups of exposure optimisation strategies – body exposures (for head, trunk, humerus, femur) and distal extremity exposures (elbow to finger, knee to toe). Exposure variables manipulated included kilovoltage peak (kVp), target detector exposure and milli-ampere-seconds (mAs), automatic exposure control (AEC), additional beam filtration, and use of antiscatter grid. Mean dose area product (DAP) reductions of up to 83% for anterior–posterior (AP)/posterior–anterior (PA) abdomen projections were recorded postoptimisation due to manipulation of multiple-exposure variables. For body exposures, the target EI and detector exposure, and thus the required mAs were typically 20% less postoptimisation. Image quality for some distal extremity exposures was improved by lowering kVp and increasing mAs around constant entrance skin dose. It is recommended that purchasing digital X-ray equipment with high detective quantum efficiency detectors, and then optimising the exposure chart for use with these detectors is of high importance for sites performing paediatric imaging. Multiple-exposure variables may need to be manipulated to achieve optimal outcomes.
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Affiliation(s)
- Stephen P Knight
- Department of Medical Imaging, Royal Children's Hospital Brisbane, Queensland, Australia
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Precht H, Gerke O, Rosendahl K, Tingberg A, Waaler D. Large dose reduction by optimization of multifrequency processing software in digital radiography at follow-up examinations of the pediatric femur. Pediatr Radiol 2014; 44:239-40. [PMID: 24366605 DOI: 10.1007/s00247-013-2854-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 11/27/2013] [Indexed: 11/26/2022]
Affiliation(s)
- Helle Precht
- Conrad Research Center, University College Lillebelt, Blangstedgaardsvej 4, 5220, Odense, SO, Denmark,
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