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15.04.2021 | Chest

Radiation dose reduction with the wide-volume scan mode for interstitial lung diseases

verfasst von: Alain Abdo, Elige Karam, Théophraste Henry, Sébastien Leygnac, Karim Haioun, Antoine Khalil, Marie-Pierre Debray

Erschienen in: European Radiology | Ausgabe 10/2021

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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 (CTDI_vol, DLP) and image quality, including analysis of normal structures, lesions, overall image quality, and artifacts (Wilcoxon signed-rank test).

Results

Median CTDI_vol 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 CTDI_vol 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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Titel: Radiation dose reduction with the wide-volume scan mode for interstitial lung diseases
verfasst von: Alain Abdo
Elige Karam
Théophraste Henry
Sébastien Leygnac
Karim Haioun
Antoine Khalil
Marie-Pierre Debray
Publikationsdatum: 15.04.2021
Verlag: Springer Berlin Heidelberg
Erschienen in: European Radiology / Ausgabe 10/2021
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-021-07862-5

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Radiation dose reduction with the wide-volume scan mode for interstitial lung diseases