Temporal averaging angiographic reconstructions from whole-brain CT perfusion for the detection of vasospasm

The aim of this study is to evaluate the image quality and diagnostic performance of angiographic images reconstructed from whole-brain CT perfusion (CTP) using temporal averaging compared to CT angiography (CTA) for the detection of vasospasm. 39 CT studies in 28 consecutive patients who underwent...

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Published in:Journal of neuroradiology 2023-05, Vol.50 (3), p.333-340
Main Authors: Gallissot, Félix, Lenfant, Marc, Thouant, Pierre, Haioun, Karim, Thay, Anthony, Ricolfi, Frédéric, Comby, Pierre-Olivier
Format: Article
Language:English
Subjects:
Brain - diagnostic imaging
Brain computed tomography perfusion
Computed tomography angiography
Computed Tomography Angiography - methods
Humans
Image reconstruction
Perfusion
Radiation Dosage
Radiographic Image Interpretation, Computer-Assisted
Retrospective Studies
Subarachnoid hemorrhage
Temporal averaging
Vasospasm
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Summary:The aim of this study is to evaluate the image quality and diagnostic performance of angiographic images reconstructed from whole-brain CT perfusion (CTP) using temporal averaging compared to CT angiography (CTA) for the detection of vasospasm. 39 CT studies in 28 consecutive patients who underwent brain CTA with CTP for suspected vasospasm between September 2020 and May 2021 were retrospectively evaluated. The image quality of these two vascular imaging techniques was assessed either quantitatively (image noise, vascular enhancement, signal-to-noise (SNR) and contrast-to-noise (CNR) ratios,) and qualitatively (4 criteria assessed on a 5-point scale). Intra and interobserver agreements and a diagnostic confidence score on the diagnosis of vasospasm were measured. Radiation dose parameters (volume CT dose index (CTDIvol) and dose-length product (DLP)) were recorded. Both SNR and CNR were significantly higher with temporal averaging compared to CTA, increasing by 104% and 113%, respectively (p
ISSN:0150-9861
DOI:10.1016/j.neurad.2022.10.001