1
|
Björkman AS, Malusek A, Gauffin H, Persson A, Koskinen SK. Spectral photon-counting CT: Image quality evaluation using a metal-containing bovine bone specimen. Eur J Radiol 2023; 168:111110. [PMID: 37788519 DOI: 10.1016/j.ejrad.2023.111110] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 09/10/2023] [Accepted: 09/22/2023] [Indexed: 10/05/2023]
Abstract
PURPOSE To find the optimal imaging parameters for a photon-counting detector CT (PCD-CT) and to compare it to an energy-integrating detector CT (EID-CT) in terms of image quality and metal artefact severity using a metal-containing bovine knee specimen. METHODS A bovine knee with a stainless-steel plate and screws was imaged in a whole-body research PCD-CT at 120 kV and 140 kV and in an EID dual-source CT (DSCT) at Sn150 kV and 80/Sn150 kV. PCD-CT virtual monoenergetic 72 and 150 keV images and EID-CT images processed with and without metal artefact reduction algorithms (iMAR) were compared. Four radiologists rated the visualisation of bony structures and metal artefact severity. The Friedman test and Wilcoxon signed-rank test with Bonferroni's correction were used. P-values of ≤ 0.0001 were considered statistically significant. Distributions of HU values of regions of interest (ROIs) in artefact-affected areas were analysed. RESULTS PCD-CT 140 kV 150 keV images received the highest scores and were significantly better than EID-CT Sn150 kV images. PCD-CT 72 keV images were rated significantly lower than all the others. HU-value variation was larger in the 120 kV and the 72 keV images. The ROI analysis revealed no large difference between scanners regarding artefact severity. CONCLUSION PCD-CT 140 kV 150 keV images of a metal-containing bovine knee specimen provided the best image quality. They were superior to, or as good as, the best EID-CT images; even without the presumed advantage of tin filter and metal artefact reduction algorithms. PCD-CT is a promising method for reducing metal artefacts.
Collapse
Affiliation(s)
- Ann-Sofi Björkman
- Center for Medical Image Science and Visualization (CMIV), Linköping University, SE-581 85 Linköping, Sweden; Department of Radiology in Linköping, Center for Diagnostics, Röntgenkliniken, Universitetssjukhuset, SE-581 85 Linköping, Sweden; Department of Health, Medicine and Caring Sciences, Linköping University, SE-581 85 Linköping, Sweden.
| | - Alexandr Malusek
- Center for Medical Image Science and Visualization (CMIV), Linköping University, SE-581 85 Linköping, Sweden; Department of Health, Medicine and Caring Sciences, Linköping University, SE-581 85 Linköping, Sweden.
| | - Håkan Gauffin
- Center for Medical Image Science and Visualization (CMIV), Linköping University, SE-581 85 Linköping, Sweden; Department of Orthopedics, Linköping University, Universitetssjukhuset, SE-581 85 Linköping, Sweden; Department of Biomedical and Clinical Sciences, Linköping University, SE-581 85 Linköping, Sweden.
| | - Anders Persson
- Center for Medical Image Science and Visualization (CMIV), Linköping University, SE-581 85 Linköping, Sweden; Department of Radiology in Linköping, Center for Diagnostics, Röntgenkliniken, Universitetssjukhuset, SE-581 85 Linköping, Sweden; Department of Health, Medicine and Caring Sciences, Linköping University, SE-581 85 Linköping, Sweden.
| | - Seppo K Koskinen
- Center for Medical Image Science and Visualization (CMIV), Linköping University, SE-581 85 Linköping, Sweden; Terveystalo Inc., Jaakonkatu 3, 00100 Helsinki, Finland; Department of Clinical Science, Intervention, and Technology, Division for Radiology, Karolinska Institutet, SE-141 86 Stockholm, Sweden.
| |
Collapse
|
2
|
Hooper T, Eccles G, Milliken T, Mathieu-Burry JR, Reed W. Dose reduction in CT imaging for facial bone trauma in adults: A narrative literature review. J Med Radiat Sci 2019; 66:122-132. [PMID: 30706691 PMCID: PMC6545476 DOI: 10.1002/jmrs.319] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 12/15/2018] [Accepted: 12/18/2018] [Indexed: 01/08/2023] Open
Abstract
Trauma to the facial area accounts for a significant number of admissions to the emergency department. Diagnostic imaging is almost always required, and is critical in determining patient management. Multi‐detector computed tomography (MDCT) appears consistently in the literature as the gold‐standard imaging modality for facial bones, but results in a high radiation dose to the patient. This makes the application and advancement of dose reduction and dose optimisation methods vital. This narrative review presents a critical analysis of the literature concerning diagnostic imaging of facial bone trauma, with an emphasis on dose reduction methods for MDCT. Databases including Pubmed, Medline, Web of Science and Scopus were used to investigate this topic, with the key words: facial bone trauma, computed tomography (CT) imaging and dose reduction. Exclusion criteria included studies on nasal bone fracturing, dental imaging, elective surgeries and paediatric imaging. The literature shows overwhelming support for MDCT, given its accuracy, efficiency and ease of operation. Noise reducing reconstruction algorithms show promise as a successful method of dose reduction in facial bone imaging. Investigations of more innovative techniques also appear within the literature, including diagnostic cone‐beam CT (CBCT), intraoperative CBCT and dual‐source CT (DSCT), but further research is required to confirm their clinical value.
Collapse
Affiliation(s)
- Tayla Hooper
- Discipline of Medical Radiation Sciences, the University of Sydney, Lidcombe, Australia
| | - Grace Eccles
- Discipline of Medical Radiation Sciences, the University of Sydney, Lidcombe, Australia
| | - Talia Milliken
- Discipline of Medical Radiation Sciences, the University of Sydney, Lidcombe, Australia
| | | | - Warren Reed
- Discipline of Medical Radiation Sciences, the University of Sydney, Lidcombe, Australia
| |
Collapse
|
3
|
A comparison of panoramic radiography and cone beam computed tomography in the detection of osteosynthesis complications in sheep mandibular angle fractures. Oral Surg Oral Med Oral Pathol Oral Radiol 2018; 127:167-174. [PMID: 30415905 DOI: 10.1016/j.oooo.2018.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 09/26/2018] [Accepted: 10/05/2018] [Indexed: 11/23/2022]
Abstract
OBJECTIVE The aim of this study was to compare the diagnostic efficacy of panoramic radiography (PANO) and cone beam computed tomography (CBCT) in detecting simulated complications of plate osteosynthesis applied to mandibular angle fractures (MAFs). STUDY DESIGN Unfavorable MAFs were created in 100 fresh sheep hemimandibles. Fractures were fixed with 4-hole titanium miniplates and screws. Bone necrosis around the screws, penetration of the screw into the inferior alveolar canal, screw loosening, and plate breakage were simulated. The diagnostic efficacy of the imaging techniques was compared by using intra- and interobserver agreement scores and area under the receiver operating characteristic curve (AUC) values. Examination time (ET), confidence scores (CS), and planar preference (PP) in CBCT evaluation were assessed. RESULTS Intra- and interobserver agreement scores varied between 0.61 and 0.91. AUCs for screw penetration into the inferior alveolar canal and screw loosening were significantly higher in CBCT than in PANO (P < .05). CBCT presented significantly higher ET and CS values compared with PANO (P < .05). PP showed significant differences among types of complications (P < .05). CONCLUSIONS PANO provided acceptable outcomes in the detection of bone necrosis and broken plates around the screw, but CBCT was more likely to enable detection of all simulated types of complications with higher confidence.
Collapse
|
4
|
Kuusisto N, Huumonen S, Kotiaho A, Haapea M, Rekola J, Vallittu P. Intensity of artefacts in cone beam CT examinations caused by titanium and glass fibre-reinforced composite implants. Dentomaxillofac Radiol 2018; 48:20170471. [PMID: 30084258 DOI: 10.1259/dmfr.20170471] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
OBJECTIVES: The aim was to compare titanium and glass fibre-reinforced composite (FRC) orbital floor implants using cone beam CT (CBCT). FRC implants are nonmetallic and these implants have not been analysed in CBCT images before. The purpose of this study is to compare the artefact formation of the titanium and the FRC orbital floor implants in CBCT images. METHODS: One commercially pure titanium and one S-glass FRC with bioactive glass particles implant were imaged with CBCT using the same imaging values (80 kV, 1 mA, FOV 60 × 60 mm). CBCT images were analysed in axial slices from three areas to determine the magnitude of the artefacts in the vicinity of the implants. Quantified results based on the gray values of images were analysed using analysis-of-variance. RESULTS: Compared to the reference the gray values of the titanium implant are more negative in every region of interest in all slices (p < 0.05) whereas the gray values of the FRC implant differ statistically significantly in less than half of the examined areas. CONCLUSIONS: The titanium implant caused artefacts in all of the analysed CBCT slices. Compared to the reference the gray values of the FRC implant changed only slightly and this feature enables to use wider imaging options postoperatively.
Collapse
Affiliation(s)
- Niina Kuusisto
- 1 Department of Oral Pathology and Radiology, Institute of Dentistry, University of Turku , Turku , Finland.,2 Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC, Institute of Dentistry and BioCity, University of Turku and City of Turku, Welfare Division , Turku , Finland.,3 Department of Diagnostic Imaging, Turku University Hospital , Turku , Finland
| | - Sisko Huumonen
- 1 Department of Oral Pathology and Radiology, Institute of Dentistry, University of Turku , Turku , Finland.,3 Department of Diagnostic Imaging, Turku University Hospital , Turku , Finland.,4 Department of Oral Radiology, Institute of Dentistry, University of Eastern Finland , Kuopio , Finland.,5 Department of Oral and Maxillofacial Surgery, Kuopio University Hospital, Unit of Oral HealthSciences , Kuopio , Finland.,6 Department of Oral Radiology, Institute of Dentistry, University of Oulu , Oulu , Finland
| | - Antti Kotiaho
- 7 Department of Diagnostic Radiology, Oulu University Hospital , Oulu , Finland.,8 Department of Physics and Technology, Research Unit of Medical Imaging, Physics and Technology, University of Oulu , Oulu , Finland.,9 Medical Research Center, Organisation of Oulu University Hospital and University of Oulu , Oulu , Finland
| | - Marianne Haapea
- 7 Department of Diagnostic Radiology, Oulu University Hospital , Oulu , Finland.,8 Department of Physics and Technology, Research Unit of Medical Imaging, Physics and Technology, University of Oulu , Oulu , Finland.,9 Medical Research Center, Organisation of Oulu University Hospital and University of Oulu , Oulu , Finland
| | - Jami Rekola
- 10 Department of Otorhinolaryngology, Turku University Hospital , Turku , Finland
| | - Pekka Vallittu
- 2 Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC, Institute of Dentistry and BioCity, University of Turku and City of Turku, Welfare Division , Turku , Finland
| |
Collapse
|