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Abdo A, Karam E, Henry T, Leygnac S, Haioun K, Khalil A, Debray MP. Radiation dose reduction with the wide-volume scan mode for interstitial lung diseases. Eur Radiol 2021; 31:7332-7341. [PMID: 33856516 DOI: 10.1007/s00330-021-07862-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/23/2021] [Accepted: 03/10/2021] [Indexed: 12/01/2022]
Abstract
OBJECTIVES The wide-volume mode, available on wide-area detector row CTs, has the advantage of reducing exposure time and radiation dose. It is infrequently used for lung diseases. The purpose of this study is to compare image quality and radiation dose of wide-volume chest CT to those of standard helical CT in the setting of interstitial lung diseases. METHODS Retrospective monocentric study including 50 consecutive patients referred for follow-up or screening of interstitial lung diseases, requiring prone scan, acquired with the wide-volume mode, in addition to the routine supine scan, acquired with the helical mode. The optimal collimation in wide-volume mode (320 × 0.5mm or 240 × 0.5mm) was chosen according to the length of the thorax. Wide-volume acquisitions were compared to helical acquisitions for radiation dose (CTDIvol, DLP) and image quality, including analysis of normal structures, lesions, overall image quality, and artifacts (Wilcoxon signed-rank test). RESULTS Median CTDIvol and DLP with wide volumes (3.1 mGy and 94.6 mGy·cm) were significantly reduced (p < 0.0001) as compared to helical mode (3.7mGy and 122.1 mGy·cm), leading to a median 21% and 32% relative reduction of CTDIvol and DLP, respectively. Image noise and quality were not significantly different between the two modes. Misalignment artifact at the junction of two volumes was occasionally seen in the wide-volume scans and, when present, did not impair the diagnostic quality in the majority of cases. CONCLUSIONS Wide-volume mode allows 32% radiation dose reduction compared to the standard helical mode and could be used routinely for diagnosis and follow-up of interstitial lung diseases. KEY POINTS • Retrospective monocentric study showed that wide-volume scan mode reduces radiation dose by 32% in comparison to helical mode for chest CT in the setting of interstitial lung diseases. • Mild misalignment may be observed at the junction between volumes with the wide-volume mode, without decrease of image quality in the majority of cases and without impairing diagnostic quality. • Wide-volume mode could be used routinely for the diagnosis and follow-up of interstitial lung diseases.
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Affiliation(s)
- Alain Abdo
- Department of Radiology, Bichat Claude-Bernard Hospital, APHP, 46 rue Henri Huchard, F-75018, Paris, France
| | - Elige Karam
- Department of Radiology, Bichat Claude-Bernard Hospital, APHP, 46 rue Henri Huchard, F-75018, Paris, France
| | - Théophraste Henry
- Department of Nuclear Medicine, Institut Gustave Roussy, 114 rue Edouard Vaillant, 94805, Villejuif Cédex, France
| | - Sébastien Leygnac
- Department of Radiology, Bichat Claude-Bernard Hospital, APHP, 46 rue Henri Huchard, F-75018, Paris, France
- Department of Medical Physics, Bichat Claude-Bernard Hospital, APHP, Paris, France
- Faculty of Medicine, Paris Diderot University, Bichat Campus, Paris, France
- Gustave Roussy, Service de Physique Médicale, F-94805, Villejuif, France
| | - Karim Haioun
- CT Division, Canon Medical Systems France, 24 quai Gallieni, 92150, Suresnes, France
| | - Antoine Khalil
- Department of Radiology, Bichat Claude-Bernard Hospital, APHP, 46 rue Henri Huchard, F-75018, Paris, France
- Faculty of Medicine, Paris Diderot University, Bichat Campus, Paris, France
- Inserm UMR1152, Physiopathology and Epidemiology of Respiratory Diseases, Paris, France
| | - Marie-Pierre Debray
- Department of Radiology, Bichat Claude-Bernard Hospital, APHP, 46 rue Henri Huchard, F-75018, Paris, France.
- Inserm UMR1152, Physiopathology and Epidemiology of Respiratory Diseases, Paris, France.
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Sako K, Matsubara K, Matsumoto M. [An Evaluation of Radiation Dose for Wide Volume Scan during Chest CT]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2021; 77:284-292. [PMID: 33746176 DOI: 10.6009/jjrt.2021_jsrt_77_3.284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE A volume scan can cover a range of 160 mm with a single gantry rotation. It can be performed sequentially (a wide volume [WV] scan) to cover more than 160 mm, and volume Xact+ (Xact+) can be used when volume scan is done to extend the reconstruction area. The purpose of this study was to investigate the dose distribution and organ doses for a WV scan during chest CT. METHOD We arranged radiophotoluminescence glass dosimeters (RPLDs) linearly on the surface and inside of the phantom to evaluate the dose distribution along the z-axis. We also placed RPLDs at the lens, thyroid, and breast positions to evaluate organ doses. We performed WV and helical scans and WV scan using Xact+. RESULT The absorbed doses increased at the borders of the volume scans, and dose peaks were observed there. The organ doses for the WV scan outside the acquisition range were lower than those for the helical scan. The organ doses inside the acquisition range changed by the locations of borders. CONCLUSION The WV scan increases the absorbed doses at the overlapping scanned regions, which can be reduced by using Xact+.
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Affiliation(s)
- Kenji Sako
- Department of Radiological Technology, Kizawa Memorial Hospital
| | - Kosuke Matsubara
- Department of Quantum Medical Technology, Faculty of Health Sciences, Institute of Medical Pharmaceutical and Health Sciences, Kanazawa University
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Meyer E, Labani A, Schaeffer M, Jeung MY, Ludes C, Meyer A, Roy C, Leyendecker P, Ohana M. Wide-volume versus helical acquisition in unenhanced chest CT: prospective intra-patient comparison of diagnostic accuracy and radiation dose in an ultra-low-dose setting. Eur Radiol 2019; 29:6858-6866. [PMID: 31175414 DOI: 10.1007/s00330-019-06278-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/15/2019] [Accepted: 05/17/2019] [Indexed: 12/19/2022]
Abstract
OBJECTIVES Diagnostic performance and potential radiation dose reduction of wide-area detector CT sequential acquisition ("wide-volume" acquisition (WV)) in unenhanced chest examination are unknown. This study aims to assess the image quality, the diagnostic performance, and the radiation dose reduction of WV mode compared with the classical helical acquisition for lung parenchyma analysis in an ultra-low-dose (ULD) protocol. METHODS After Institutional Review Board Approval and written informed consent, 64 patients (72% men; 67.6 ± 9.7 years old; BMI 26.1 ± 5.3 kg/m2) referred for a clinically indicated unenhanced chest CT were prospectively included. All patients underwent, in addition to a standard helical acquisition (120 kV, automatic tube current modulation), two ULD acquisitions (135 kV, fixed tube current at 10 mA): one in helical mode and one in WV mode. Image noise, subjective image quality (5-level Likert scale), and diagnostic performance for the detection of 9 predetermined parenchymal abnormalities were assessed by two radiologists and compared using the chi-square or Fisher non-parametric tests. RESULTS Subjective image quality (4.2 ± 0.7 versus 4.2 ± 0.8, p = 0.56), image noise (41.7 ± 8 versus 40.9 ± 8.7, p = 0.3), and diagnostic performance were equivalent between ULD WV and ULD helical. Radiation dose was significantly lower for the ULD WV acquisition (mean dose-length product 14.1 ± 1.3 mGy cm versus 15.8 ± 1.3, p < 0.0001). CONCLUSION An additional 11% dose reduction is achieved with the WV mode in ULD chest CT with fixed tube current, with equivalent image quality and diagnostic performance when compared with the helical acquisition. KEY POINTS • Image quality and diagnostic performance of ultra-low-dose unenhanced chest CT are identical between wide-volume mode and the reference helical acquisition. • Wide-volume mode allows an additional radiation dose reduction of 11% (mean dose-length product 14.1 ± 1.3 mGy cm versus 15.8 ± 1.3, p < 0.0001).
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Affiliation(s)
- Elsa Meyer
- Radiology Department, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67000, Strasbourg, France
| | - Aissam Labani
- Radiology Department, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67000, Strasbourg, France
| | - Mickaël Schaeffer
- Radiology Department, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67000, Strasbourg, France
| | - Mi-Young Jeung
- Radiology Department, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67000, Strasbourg, France
| | - Claire Ludes
- Radiology Department, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67000, Strasbourg, France
| | - Alain Meyer
- Physiology Department, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67000, Strasbourg, France
| | - Catherine Roy
- Radiology Department, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67000, Strasbourg, France
| | - Pierre Leyendecker
- Radiology Department, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67000, Strasbourg, France
| | - Mickaël Ohana
- Radiology Department, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67000, Strasbourg, France. .,ICube Laboratory, 300 Boulevard Sébastien Brandt, 67400, Illkirch Graffenstaden, France.
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