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Puel U, Eliezer M, Boubaker F, Villani N, Assabah B, Hossu G, Gondim Teixeira PA, Blum A, Parietti-Winkler C, Gillet R. Effect of Matrix Size and Acquisition Mode on Image Quality and Radiation Dose of Ultra-High-Resolution CT of the Temporal Bone: An Anatomical Study. Can Assoc Radiol J 2024; 75:609-619. [PMID: 39086146 DOI: 10.1177/08465371241234795] [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] [Indexed: 08/02/2024] Open
Abstract
Purpose: To compare image quality and radiation exposure between super- and ultra-high-resolution helical and super-high-resolution volumetric CT of the temporal bone. Methods: Six cadaveric temporal bone specimens were used to evaluate key temporal bone structures using the following CT reconstruction and acquisition modes: helical and single-volume acquisition modes in super-high resolution (0.25-mm slice thickness, 10242 matrix), and helical mode in ultra-high resolution (0.25-mm slice thickness, 20482 matrix). Two observers performed 5 previously described preoperative measurements, measured noise and signal-to-noise ratios for air, and noise for bone, and rated the visualization of 5 anatomical structures on a 4-point scale, for each reconstruction mode. Radiation dose exposure was recorded for each examination. Results: There was no significant difference between any of the quantitative or qualitative measurements in any of the reconstruction and acquisition modes. There was a slight increase in noise and a decrease in signal-to-noise ratio in the air using the single-volume mode (115 ± 13.1 HU and 8.37 ± 0.91, respectively) compared to the helicoidal super-high-resolution (92.4 ± 11.8 HU and 10.8 ± 1.26, respectively) and helicoidal ultra-high-resolution (91.1 ± 10.7 HU and 10.9 ± 1.39, respectively) modes (P < .002). The volumic CT dose index was 50.9 mGy with helical acquisition and 29.8 mGy with single-volume acquisition mode (P < .0001). Conclusion: The single-volume super-high-resolution acquisition mode allows a reduction in radiation dose exposure without compromising image quality compared to helical scanning, but with a slightly lower signal-to-noise ratio in air with the single-volume mode, while there was no difference in image quality between the helical super- and ultra-high-resolution modes.
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Affiliation(s)
- Ulysse Puel
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, INSERM, IADI, Nancy, France
- Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
| | - Michael Eliezer
- Department of Radiology, Lariboisière Hospital, Paris, France
| | - Fatma Boubaker
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
| | - Nicolas Villani
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
| | - Bouchra Assabah
- Department of Anatomy, Université de Lorraine, Nancy, France
| | - Gabriela Hossu
- Université de Lorraine, INSERM, IADI, Nancy, France
- Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
| | - Pedro Augusto Gondim Teixeira
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, INSERM, IADI, Nancy, France
- Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
| | - Alain Blum
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, INSERM, IADI, Nancy, France
- Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
| | - Cécile Parietti-Winkler
- ENT Surgery Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
| | - Romain Gillet
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, INSERM, IADI, Nancy, France
- Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
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Boukhzer S, Eliezer M, Boubaker F, Hossu G, Blum A, Teixeira P, Parietti-Winkler C, Gillet R. Ultra-high-resolution CT of the temporal bone: The end of stapes prosthesis dimensional error and correlation with patient symptoms. Eur J Radiol 2024; 175:111467. [PMID: 38636410 DOI: 10.1016/j.ejrad.2024.111467] [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: 12/19/2023] [Revised: 03/23/2024] [Accepted: 04/11/2024] [Indexed: 04/20/2024]
Abstract
PURPOSE To describe the reliability of ultra-high-resolution computed tomography (UHR-CT) in the measurement of titanium stapes prostheses using manufacturer data as a reference. MATERIALS AND METHODS This retrospective study included patients treated by stapedectomy with titanium prostheses who underwent UHR-CT between January 2020 and October 2023. Images were acquired using an ultra-high-resolution mode (slice thickness: 0.25 mm; matrix, 1024 × 1024). Two radiologists independently evaluated the length, diameter, and intra-vestibular protrusion of the prosthesis. Post-operative air-bone gaps (ABGs) were recorded. RESULTS Fourteen patients were enrolled (mean age, 44.3 ± 13.8 [SD] years, 9 females), resulting in 16 temporal bone UHR-CTs. The exact length was obtained in 81.3 % (n = 13/16) and underestimated by 0.1 to 0.3 mm in the remaining 18.7 % (n = 3/16) CT scans for both readers (mean misestimation: -0.02 ± 0.06 [SD] mm, overall underestimation of 0.43 %). The exact diameter was reported in 75 % (n = 12/16) and 87.5 % (n = 14/16) of the CT scans for readers 1 and 2, respectively, and was off by 0.1 mm in all discrepancies (mean misestimation: 0.01 ± 0.04 [SD] mm, overall overestimation of 2.43 %). Intravestibular prosthesis protrusion was of 0.5 ± 0.43 [SD] mm (range: 0-1) and 0.49 ± 0.44 [SD] mm (range: 0-1.1) for readers 1 and 2, respectively, and did not correlate with ABGs (r = 0.25 and 0.22; P = 0.39 and 0.47 for readers 1 and 2, respectively). Intra and interobserver agreements were excellent. CONCLUSION UHR-CT provides 99.6 % and 97.6 % accuracy for prosthesis length and diameter measurements, respectively.
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Affiliation(s)
- Sara Boukhzer
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
| | - Michael Eliezer
- Department of Radiology, Lariboisière Hospital, Paris, France
| | - Fatma Boubaker
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
| | - Gabriela Hossu
- Université de Lorraine, INSERM, IADI, Nancy, France; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
| | - Alain Blum
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France; Université de Lorraine, INSERM, IADI, Nancy, France; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
| | - Pedro Teixeira
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France; Université de Lorraine, INSERM, IADI, Nancy, France; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
| | - Cécile Parietti-Winkler
- ENT Surgery Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
| | - Romain Gillet
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France; Université de Lorraine, INSERM, IADI, Nancy, France; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France.
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Dillenseger JP, Gillet R, Louis M, Bach J, Sieffert C, Meylheuc L, Palpacuer C, Bierry G, Garnon J, Blum A. Quantitative and qualitative evaluation of three MSCT for high resolution bone imaging. Eur J Radiol 2024; 173:111394. [PMID: 38428256 DOI: 10.1016/j.ejrad.2024.111394] [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: 09/05/2023] [Revised: 11/09/2023] [Accepted: 02/23/2024] [Indexed: 03/03/2024]
Abstract
INTRODUCTION Strategies for achieving high resolution varies between manufacturers. In CT, the helical mode with narrow collimation has long been considered as the gold standard for high-resolution imaging. More recently, incremental modes with small dexels and focal spot, have been developed but have not been compared with helical acquisitions under optimal conditions. The aim of this work is to compare the high-resolution acquisition strategies currently proposed by recent MSCT. METHODS Three CT systems were compared. A phantom was used to evaluate geometric accuracy, uniformity, scan slice geometry, and spatial resolution. Human dry bones were used to test different protocols on real bone architecture. A blind visual analysis was conducted by trained CT users for classifying the different acquisitions (p-values). RESULTS All systems give satisfactory results in terms of geometric accuracy and uniformity. The in-plane MTF at 5% were respectively 13.4, 15.9 and 18.1 lp/cm. Dry-bones evaluation confirms that acquisition#3 is considered as the best. CONCLUSIONS The incremental acquisition coupled with à small focal spot, and a high-sampling detector, overpasses the reference of low-pitch helical acquisitions for high-resolution imaging. Cortical bone, bony vessels, and tumoral matrix analysis are the very next challenges that will have to be managed to improve normal and pathologic bone imaging thanks to the availability UHR-CT systems.
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Affiliation(s)
- Jean-Philippe Dillenseger
- ICube - UMR 7357, CNRS, Université de Strasbourg, Strasbourg, France; Pole d'imagerie médicale, Hôpitaux universitaire de Strasbourg, Strasbourg, France.
| | - Romain Gillet
- Service D'imagerie Guilloz, CHRU Nancy, Nancy, France; IADI - U1254, Inserm, Université de Lorraine, Nancy, France
| | | | - Justin Bach
- Pole d'imagerie médicale, Hôpitaux universitaire de Strasbourg, Strasbourg, France.
| | - Cléa Sieffert
- ICube - UMR 7357, CNRS, Université de Strasbourg, Strasbourg, France.
| | - Laurence Meylheuc
- ICube - UMR 7357, CNRS, Université de Strasbourg, Strasbourg, France.
| | - Clément Palpacuer
- Clinical research department, Groupe Hospitalier Mulhouse et Sud Alsace, Mulhouse, France.
| | - Guillaume Bierry
- ICube - UMR 7357, CNRS, Université de Strasbourg, Strasbourg, France; Pole d'imagerie médicale, Hôpitaux universitaire de Strasbourg, Strasbourg, France.
| | - Julien Garnon
- ICube - UMR 7357, CNRS, Université de Strasbourg, Strasbourg, France; Pole d'imagerie médicale, Hôpitaux universitaire de Strasbourg, Strasbourg, France.
| | - Alain Blum
- Service D'imagerie Guilloz, CHRU Nancy, Nancy, France; IADI - U1254, Inserm, Université de Lorraine, Nancy, France.
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Boubaker F, Teixeira PAG, Hossu G, Douis N, Gillet P, Blum A, Gillet R. In vivo depiction of cortical bone vascularization with ultra-high resolution-CT and deep learning algorithm reconstruction using osteoid osteoma as a model. Diagn Interv Imaging 2024; 105:26-32. [PMID: 37482455 DOI: 10.1016/j.diii.2023.07.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 06/24/2023] [Accepted: 07/12/2023] [Indexed: 07/25/2023]
Abstract
PURPOSE The purpose of this study was to evaluate the ability to depict in vivo bone vascularization using ultra-high-resolution (UHR) computed tomography (CT) with deep learning reconstruction (DLR) and hybrid iterative reconstruction algorithm, compared to simulated conventional CT, using osteoid osteoma as a model. MATERIALS AND METHODS Patients with histopathologically proven cortical osteoid osteoma who underwent UHR-CT between October 2019 and October 2022 were retrospectively included. Images were acquired with a 1024 × 1024 matrix and reconstructed with DLR and hybrid iterative reconstruction algorithm. To simulate conventional CT, images with a 512 × 512 matrix were also reconstructed. Two radiologists (R1, R2) independently evaluated the number of blood vessels entering the nidus and crossing the bone cortex, as well as vessel identification and image quality with a 5-point scale. Standard deviation (SD) of attenuation in the adjacent muscle and that of air were used as image noise and recorded. RESULTS Thirteen patients with 13 osteoid osteomas were included. There were 11 men and two women with a mean age of 21.8 ± 9.1 (SD) years. For both readers, UHR-CT with DLR depicted more nidus vessels (11.5 ± 4.3 [SD] (R1) and 11.9 ± 4.6 [SD] (R2)) and cortical vessels (4 ± 3.8 [SD] and 4.3 ± 4.1 [SD], respectively) than UHR-CT with hybrid iterative reconstruction (10.5 ± 4.3 [SD] and 10.4 ± 4.6 [SD], and 4.1 ± 3.8 [SD] and 4.3 ± 3.8 [SD], respectively) and simulated conventional CT (5.3 ± 2.2 [SD] and 6.4 ± 2.5 [SD], 2 ± 1.2 [SD] and 2.4 ± 1.6 [SD], respectively) (P < 0.05). UHR-CT with DLR provided less image noise than simulated conventional CT and UHR-CT with hybrid iterative reconstruction (P < 0.05). UHR-CT with DLR received the greatest score and simulated conventional CT the lowest score for vessel identification and image quality. CONCLUSION UHR-CT with DLR shows less noise than UHR-CT with hybrid iterative reconstruction and significantly improves cortical bone vascularization depiction compared to simulated conventional CT.
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Affiliation(s)
- Fatma Boubaker
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, 54000, Nancy, France
| | - Pedro Augusto Gondim Teixeira
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, 54000, Nancy, France; Université de Lorraine, INSERM, IADI, 54000, Nancy, France; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, 54000, Nancy, France
| | - Gabriela Hossu
- Université de Lorraine, INSERM, IADI, 54000, Nancy, France; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, 54000, Nancy, France
| | - Nicolas Douis
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, 54000, Nancy, France
| | - Pierre Gillet
- Université de Lorraine, CNRS, IMoPA, 54000, Nancy, France
| | - Alain Blum
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, 54000, Nancy, France; Université de Lorraine, INSERM, IADI, 54000, Nancy, France; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, 54000, Nancy, France
| | - Romain Gillet
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, 54000, Nancy, France; Université de Lorraine, INSERM, IADI, 54000, Nancy, France; Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, 54000, Nancy, France.
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Gillet R, Boubaker F, Hossu G, Thay A, Gillet P, Blum A, Teixeira PAG. Computed Tomography Bone Imaging: Pushing the Boundaries in Clinical Practice. Semin Musculoskelet Radiol 2023; 27:397-410. [PMID: 37748463 DOI: 10.1055/s-0043-1768451] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
Bone microarchitecture has several clinical implications over and above estimating bone strength. Computed tomography (CT) analysis mainly uses high-resolution peripheral quantitative CT and micro-CT, research imaging techniques, most often limited to peripheral skeleton assessment. Ultra-high-resolution (UHR) CT and photon-counting detector CT, two commercially available techniques, provide images that can approach the spatial resolution of the trabeculae, bringing bone microarchitecture analysis into clinical practice and improving depiction of bone vascularization, tumor matrix, and cortical and periosteal bone. This review presents bone microarchitecture anatomy, principles of analysis, reference measurements, and an update on the performance and potential clinical applications of these new CT techniques. We also share our clinical experience and technical considerations using an UHR-CT device.
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Affiliation(s)
- Romain Gillet
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, INSERM, IADI, Nancy, France
| | - Fatma Boubaker
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
| | - Gabriela Hossu
- Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, INSERM, IADI, Nancy, France
| | | | | | - Alain Blum
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, INSERM, IADI, Nancy, France
| | - Pedro Augusto Gondim Teixeira
- Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, CIC, Innovation Technologique, University Hospital Center of Nancy, Nancy, France
- Université de Lorraine, INSERM, IADI, Nancy, France
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Gondim Teixeira PA, Lemore A, Vogt N, Oster J, Hossu G, Gillet R, Blum A. Initial Evaluation of Focal Bone Lesions: How Do We Do It? Semin Musculoskelet Radiol 2023; 27:471-479. [PMID: 37748471 DOI: 10.1055/s-0043-1769775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
Focal bone lesions are frequent, and management greatly depends on the characteristics of their images. After briefly discussing the required work-up, we analyze the most relevant imaging signs for assessing potential aggressiveness. We also describe the imaging aspects of the various types of lesion matrices and their clinical implications.
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Affiliation(s)
- Pedro Augusto Gondim Teixeira
- Guilloz Imaging Department, University Hospital Center of Nancy, Central Hospital, Nancy Cedex, France
- Université de Lorraine, INSERM, Laboratoire d'Imagerie Diagnostic et Interventionnelle - IADI, Nancy, France
| | - Astrée Lemore
- Guilloz Imaging Department, University Hospital Center of Nancy, Central Hospital, Nancy Cedex, France
- Université de Lorraine, INSERM, Laboratoire d'Imagerie Diagnostic et Interventionnelle - IADI, Nancy, France
| | - Nora Vogt
- Université de Lorraine, INSERM, Laboratoire d'Imagerie Diagnostic et Interventionnelle - IADI, Nancy, France
| | - Julien Oster
- Université de Lorraine, INSERM, Laboratoire d'Imagerie Diagnostic et Interventionnelle - IADI, Nancy, France
| | - Gabriela Hossu
- Université de Lorraine, INSERM, Laboratoire d'Imagerie Diagnostic et Interventionnelle - IADI, Nancy, France
| | - Romain Gillet
- Guilloz Imaging Department, University Hospital Center of Nancy, Central Hospital, Nancy Cedex, France
- Université de Lorraine, INSERM, Laboratoire d'Imagerie Diagnostic et Interventionnelle - IADI, Nancy, France
| | - Alain Blum
- Guilloz Imaging Department, University Hospital Center of Nancy, Central Hospital, Nancy Cedex, France
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Zhang J, Mazlin V, Fei K, Boccara AC, Yuan J, Xiao P. Time-domain full-field optical coherence tomography (TD-FF-OCT) in ophthalmic imaging. Ther Adv Chronic Dis 2023; 14:20406223231170146. [PMID: 37152350 PMCID: PMC10161339 DOI: 10.1177/20406223231170146] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Accepted: 03/29/2023] [Indexed: 05/09/2023] Open
Abstract
Ocular imaging plays an irreplaceable role in the evaluation of eye diseases. Developing cellular-resolution ophthalmic imaging technique for more accurate and effective diagnosis and pathogenesis analysis of ocular diseases is a hot topic in the cross-cutting areas of ophthalmology and imaging. Currently, ocular imaging with traditional optical coherence tomography (OCT) is limited in lateral resolution and thus can hardly resolve cellular structures. Conventional OCT technology obtains ultra-high resolution at the expense of a certain imaging range and cannot achieve full field of view imaging. In the early years, Time-domain full-field OCT (TD-FF-OCT) has been mainly used for ex vivo ophthalmic tissue studies, limited by the low speed and low full-well capacity of existing two-dimensional (2D) cameras. The recent improvements in system design opened new imaging possibilities for in vivo applications thanks to its distinctive optical properties of TD-FF-OCT such as a spatial resolution almost insensitive to aberrations, and the possibility to control the curvature of the optical slice. This review also attempts to look at the future directions of TD-FF-OCT evolution, for example, the potential transfer of the functional-imaging dynamic TD-FF-OCT from the ex vivo into in vivo use and its expected benefit in basic and clinical ophthalmic research. Through non-invasive, wide-field, and cellular-resolution imaging, TD-FF-OCT has great potential to be the next-generation imaging modality to improve our understanding of human eye physiology and pathology.
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Affiliation(s)
- Jinze Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Viacheslav Mazlin
- ESPCI Paris, PSL University, CNRS, Langevin Institute, Paris, France
| | - Keyi Fei
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | | | - Jin Yuan
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Jinsui Road 7, Guangzhou 510060, Guangdong, China
| | - Peng Xiao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Jinsui Road 7, Guangzhou 510060, Guangdong, China
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Sonnow L, Salimova N, Behrendt L, Wacker FK, Örgel M, Plagge J, Weidemann F. Photon-counting CT of elbow joint fractures: image quality in a simulated post-trauma setting with off-center positioning. Eur Radiol Exp 2023; 7:15. [PMID: 36967394 PMCID: PMC10040392 DOI: 10.1186/s41747-023-00329-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 01/30/2023] [Indexed: 03/28/2023] Open
Abstract
BACKGROUND Photon-counting detector computed tomography (PCD-CT) has the potential to provide superior image quality compared to energy-integrating detector computed tomography (EID-CT). We compared the two systems for elbow imaging in off-center arm positioning, 90° flexion, and cast fixation in a simulated post-trauma setting. METHODS The institutional review board approved the study protocol. In a cadaver study, an olecranon fracture was artificially created in ten whole arm specimens. Two different scanning positions were evaluated: (a) arm overhead; and (b) arm on top of the abdomen of a whole-body phantom. The ultra-high resolution mode with three dose protocols and two reconstruction kernels was applied. Two blinded radiologists independently evaluated fracture and trabecular bone delineation. Signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and cortical sharpness measurements were performed. Cohen κ correlations, Mann-Whitney U and Wilcoxon signed rank tests were used. A p value lower than 0.05 was considered statistically significant. RESULTS Dose-equivalent PCD-CT scans were rated better for fracture and trabecular bone evaluation (p < 0.001). SNR, CNR, and cortical sharpness were higher for all diagnostic (Br76) PCD-CT images (p < 0.001). The arm position had less effect on image quality in the PCD-CT compared to the EID-CT. The use of a sharp bone kernel (Br89) improved image quality ratings for PCD-CT. In the low-dose scan mode, PCD-CT resulted in more diagnostic scans (75%) compared to EID-CT (19%). CONCLUSIONS PCD-CT provided superior objective and subjective image quality for fracture and trabecular bone structures delineation of the elbow compared to EID-CT in a typical post-trauma setting. KEY POINTS • Photon-counting detector computed tomography (PCD-CT) preserved high image quality in elbow imaging with off-center positions. • PCD-CT was advantageous for bone evaluation in trauma elbows. • PCD-CT ultra-high-resolution mode and very sharp reconstruction kernels facilitated higher image quality.
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Affiliation(s)
- Lena Sonnow
- Department of Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany.
| | - Nigar Salimova
- Department of Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
| | - Lea Behrendt
- Department of Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
| | - Frank K Wacker
- Department of Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
| | - Marcus Örgel
- Department of Trauma Surgery, Hannover Medical School, Hannover, Germany
| | - Jochen Plagge
- Department of Orthopedic Surgery, Hannover Medical School at Diakovere Annastift, Hannover, Germany
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Baylosis BL, McQuiston AS, Bayne CO, Szabo RM, Boutin RD. Pre-operative imaging for surgical decision-making and the frequency of wrist arthrodesis and carpectomy procedures: a scoping review. Skeletal Radiol 2023; 52:143-150. [PMID: 35970955 DOI: 10.1007/s00256-022-04157-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 08/06/2022] [Accepted: 08/08/2022] [Indexed: 02/02/2023]
Abstract
OBJECTIVES Our objectives were to (1) analyze the imaging modalities utilized pre-operatively that influence surgical decision-making for wrist arthrodesis and carpectomy procedures and (2) determine the type and frequency of these procedures for the treatment of wrist arthritis. MATERIALS AND METHODS This review was performed according to the guidelines of PRISMA Extension for Scoping Reviews. Using PubMed, Embase, and Scopus, peer-reviewed literature from 2011 to 2022 was searched for use of imaging in pre-operative decision-making for wrist arthrodesis and carpectomy surgical procedures. Data were compiled to determine the type(s) of imaging modalities used pre-operatively and types of surgical techniques reported in the literature. RESULTS Of 307 articles identified, 35 articles satisfied eligibility criteria, with a total of 1377 patients (68% men; age mean, 50.9 years [range, 10-81]) and 1428 wrist surgical interventions. Radiography was reported for pre-operative planning in all articles for all patients. Pre-operative cross-sectional imaging was reported in 2 articles (5.7%), but no articles reported detailed data on how CT or MRI influenced pre-operative wrist arthrodesis and carpectomy procedure decision-making. A dozen different types of surgical techniques were reported. The four most common procedures were four-corner arthrodesis with scaphoid excision (846, 59%), proximal row carpectomy (239, 17%), total wrist arthrodesis (130, 9%), and scaphocapitate arthrodesis (53, 4%). CONCLUSION Radiography is always used in pre-operative decision-making, but the literature lacks data on the influence of CT and MRI for selecting among a dozen different types of wrist arthrodesis and carpectomy procedures.
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Affiliation(s)
- Barry L Baylosis
- Department of Radiology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305-5105, USA
| | - Alexander S McQuiston
- Stanford University School of Medicine, 3801 Miranda Ave. Bldg. 710, Palo Alto, CA, 94304, USA
| | - Christopher O Bayne
- Department of Orthopaedic Surgery, UC Davis School of Medicine, 4860 Y St, Ste 3800, Sacramento, CA, 95817, USA
| | - Robert M Szabo
- Department of Orthopaedic Surgery, UC Davis School of Medicine, 4860 Y St, Ste 3800, Sacramento, CA, 95817, USA
| | - Robert D Boutin
- Department of Radiology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305-5105, USA.
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Booij R, Kämmerling NF, Oei EHG, Persson A, Tesselaar E. Assessment of visibility of bone structures in the wrist using normal and half of the radiation dose with photon-counting detector CT. Eur J Radiol 2023; 159:110662. [PMID: 36565594 DOI: 10.1016/j.ejrad.2022.110662] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 12/13/2022] [Accepted: 12/15/2022] [Indexed: 12/24/2022]
Abstract
PURPOSE To quantitatively and qualitatively assess the visibility of bone structures in the wrist on photon-counting detector computed tomography (PCD-CT) images compared to state-of-the-art energy-integrating detector CT (EID-CT). METHOD Four human cadaveric wrist specimens were scanned with EID-CT and PCD-CT at identical CTDIvol of 12.2 mGy and with 6.1 mGy (half dose PCD-CT). Axial images were reconstructed using the thinnest possible slice thickness, i.e. 0.4 mm on EID-CT and 0.2 mm on PCD-CT, with the largest image matrix size possible using reconstruction kernels optimized for bone (EID-CT: Ur68, PCD-CT: Br92). Quantitative evaluation was performed to determine contrast-noise ratio (CNR) of bone/ fat, cortical and trabecular sharpness. An observer study using visual grading characteristics (VGC) analysis was performed by six observers to assess the visibility of nutrient canals, trabecular architecture, cortical bone and the general image quality. RESULTS At equal dose, images obtained with PCD-CT had 39 ± 6 % lower CNR (p = 0.001), 71 ± 57 % higher trabecular sharpness in the radius (p = 0.02) and 42 ± 8 % (p < 0.05) sharper cortical edges than those obtained with EID-CT. This was confirmed by VGC analysis showing a superior visibility of nutrient canals, trabeculae and cortical bone area under the curve (AUC) > 0.89) for PCD-CT, even at half dose. CONCLUSIONS Despite a lower CNR and increased noise, the trabecular and cortical sharpness were twofold higher with PCD-CT. Visual grading analysis demonstrated superior visibility of cortical bone, trabeculae, nutrient canals and an overall improved image quality with PCD-CT over EID-CT. At half dose, PCD-CT also yielded superior image quality, both in quantitative measures and as evaluated by radiologists.
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Affiliation(s)
- Ronald Booij
- Department of Radiology & Nuclear Medicine, Erasmus Medical Center, Rotterdam, the Netherlands; Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden.
| | - Nina F Kämmerling
- Department of Radiology and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden.
| | - Edwin H G Oei
- Department of Radiology & Nuclear Medicine, Erasmus Medical Center, Rotterdam, the Netherlands.
| | - Anders Persson
- Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden.
| | - Erik Tesselaar
- Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden; Department of Medical Radiation Physics, and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden.
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11
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Improved visualization of the wrist at lower radiation dose with photon-counting-detector CT. Skeletal Radiol 2023; 52:23-29. [PMID: 35831718 DOI: 10.1007/s00256-022-04117-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 07/03/2022] [Accepted: 07/04/2022] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To compare the image quality of ultra-high-resolution wrist CTs acquired on photon-counting detector CT versus conventional energy-integrating-detector CT systems. MATERIALS AND METHODS Participants were scanned on a photon-counting-detector CT system after clinical energy-integrating detector CTs. Energy-integrating-detector CT scan parameters: comb filter-based ultra-high-resolution mode, 120 kV, 250 mAs, Ur70 or Ur73 kernel, 0.4- or 0.6-mm section thickness. Photon-counting-detector CT scan parameters: non-comb-based ultra-high-resolution mode, 120 kV, 120 mAs, Br84 kernel, 0.4-mm section thickness. Two musculoskeletal radiologists blinded to CT system, scored specific osseous structures using a 5-point Likert scale (1 to 5). The Wilcoxon rank-sum test was used for statistical analysis of reader scores. Paired t-test was used to compare volume CT dose index, bone CT number, and image noise between CT systems. P-value < 0.05 was considered statistically significant. RESULTS Twelve wrists (mean participant age 55.3 ± 17.8, 6 females, 6 males) were included. The mean volume CT dose index was lower for photon-counting detector CT (9.6 ± 0.1 mGy versus 19.0 ± 6.7 mGy, p < .001). Photon-counting-detector CT images had higher Likert scores for visualization of osseous structures (median score = 4, p < 0.001). The mean bone CT number was higher in photon-counting-detector CT images (1946 ± 77 HU versus 1727 ± 49 HU, p < 0.001). Conversely, there was no difference in the mean image noise of the two CT systems (63 ± 6 HU versus 61 ± 6 HU, p = 0.13). CONCLUSION Ultra-high-resolution imaging with photon-counting-detector CT depicted wrist structures more clearly than conventional energy-integrating-detector CT despite a 49% radiation dose reduction.
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Booij R, Sandstedt M, Tesselaar E, Farnebo S. Photon-counting detector computed tomography (PCD-CT) - an emerging technology in hand and wrist imaging. J Hand Surg Eur Vol 2022; 48:489-494. [PMID: 36324209 DOI: 10.1177/17531934221132692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ronald Booij
- Department of Radiology & Nuclear Medicine, Erasmus MC, The Netherlands.,Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden
| | - Mårten Sandstedt
- Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden.,Department of Radiology, and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
| | - Erik Tesselaar
- Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden.,Department of Medical Radiation Physics, and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
| | - Simon Farnebo
- Department of Hand Surgery, Plastic Surgery and Burns in Linköping, and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
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