Automated CT Perfusion Imaging Versus Non-contrast CT for Ischemic Core Assessment in Large Vessel Occlusion

Anderson Chun On Tsang, Stephanie Lenck, Christopher Hilditch, Patrick Nicholson, Waleed Brinjikji, Timo Krings, Vitor M. Pereira, Frank L. Silver, Joanna D. Schaafsma

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Purpose: There is increasing use of automated computed tomography perfusion (CTP) to aid thrombectomy decision in emergent large vessel occlusion. It is important to understand the performance of these software packages in predicting ischemic core and tissue-at-risk in the real-world setting. The aim of this study was to evaluate whether ischemic core on non-contrast CT (NCCT) and automated CTP correspond and predict infarct extent after thrombectomy for ischemic stroke. Methods: Consecutive patients with acute anterior circulation large vessel occlusion undergoing successful thrombectomy (TICI 2b/3) were studied. All patients had baseline CT, CTP with RAPID post-processing software (RAPID-CTP), and post-thrombectomy 24 h CT. Ischemic cores were assessed by two blinded raters independently using the Alberta Stroke Program Early Computed Tomography Score (ASPECTS) on each modality. The interrater agreement for ASPECTS, and correlation between baseline CT-ASPECTS, RAPID-CTP-ASPECTS, and 24h CT-ASPECTS were calculated. Results: A total of 86 patients with a mean age of 70.3 years (SD 16.5) were studied. The median baseline CT-ASPECTS was 9.5 (interquartile range, IQR 8–10), median RAPID-CTP-ASPECTS was 9 (IQR 8–10), and mean RAPID-CTP-ischemic core volume was 14.4 ml (SD 27.9 ml). The mean mismatch volume (difference of Tmax > 6s and cerebral blood flow (CBF) < 30%) was 128.6 ml (SD 126.0 ml). There was substantial correlation between baseline and 24h CT-ASPECTS (rs: 0.62; p < 0.001), but poor correlation between RAPID-CTP-ASPECTS and RAPID-CTP ischemic core volume with 24h NCCT-ASPECTS (rs: 0.21; p = 0.06 and −0.16; p = 0.15 respectively). The positive predictive value of any established infarct for baseline CT-ASPECTS was 81%, while that of RAPID-CTP-ASPECTS was 64%. Conclusion: In this series of successfully revascularized patients, ischemic core as estimated by RAPID-CTP-ASPECTS did not correlate with the baseline CT and tended to depict a larger infarct core than the infarct extent as assessed by 24h CT-ASPECTS.

Original languageEnglish (US)
JournalClinical Neuroradiology
DOIs
StateAccepted/In press - Jan 1 2018
Externally publishedYes

Fingerprint

Perfusion Imaging
Tomography
Alberta
Stroke
Perfusion
Thrombectomy
Cerebrovascular Circulation
Software

Keywords

  • Endovascular thrombectomy
  • Ischemic stroke
  • Large vessel occlusion
  • RAPID
  • Stroke imaging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Clinical Neurology

Cite this

Automated CT Perfusion Imaging Versus Non-contrast CT for Ischemic Core Assessment in Large Vessel Occlusion. / Tsang, Anderson Chun On; Lenck, Stephanie; Hilditch, Christopher; Nicholson, Patrick; Brinjikji, Waleed; Krings, Timo; Pereira, Vitor M.; Silver, Frank L.; Schaafsma, Joanna D.

In: Clinical Neuroradiology, 01.01.2018.

Research output: Contribution to journalArticle

Tsang, Anderson Chun On ; Lenck, Stephanie ; Hilditch, Christopher ; Nicholson, Patrick ; Brinjikji, Waleed ; Krings, Timo ; Pereira, Vitor M. ; Silver, Frank L. ; Schaafsma, Joanna D. / Automated CT Perfusion Imaging Versus Non-contrast CT for Ischemic Core Assessment in Large Vessel Occlusion. In: Clinical Neuroradiology. 2018.
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title = "Automated CT Perfusion Imaging Versus Non-contrast CT for Ischemic Core Assessment in Large Vessel Occlusion",
abstract = "Purpose: There is increasing use of automated computed tomography perfusion (CTP) to aid thrombectomy decision in emergent large vessel occlusion. It is important to understand the performance of these software packages in predicting ischemic core and tissue-at-risk in the real-world setting. The aim of this study was to evaluate whether ischemic core on non-contrast CT (NCCT) and automated CTP correspond and predict infarct extent after thrombectomy for ischemic stroke. Methods: Consecutive patients with acute anterior circulation large vessel occlusion undergoing successful thrombectomy (TICI 2b/3) were studied. All patients had baseline CT, CTP with RAPID post-processing software (RAPID-CTP), and post-thrombectomy 24 h CT. Ischemic cores were assessed by two blinded raters independently using the Alberta Stroke Program Early Computed Tomography Score (ASPECTS) on each modality. The interrater agreement for ASPECTS, and correlation between baseline CT-ASPECTS, RAPID-CTP-ASPECTS, and 24h CT-ASPECTS were calculated. Results: A total of 86 patients with a mean age of 70.3 years (SD 16.5) were studied. The median baseline CT-ASPECTS was 9.5 (interquartile range, IQR 8–10), median RAPID-CTP-ASPECTS was 9 (IQR 8–10), and mean RAPID-CTP-ischemic core volume was 14.4 ml (SD 27.9 ml). The mean mismatch volume (difference of Tmax > 6s and cerebral blood flow (CBF) < 30{\%}) was 128.6 ml (SD 126.0 ml). There was substantial correlation between baseline and 24h CT-ASPECTS (rs: 0.62; p < 0.001), but poor correlation between RAPID-CTP-ASPECTS and RAPID-CTP ischemic core volume with 24h NCCT-ASPECTS (rs: 0.21; p = 0.06 and −0.16; p = 0.15 respectively). The positive predictive value of any established infarct for baseline CT-ASPECTS was 81{\%}, while that of RAPID-CTP-ASPECTS was 64{\%}. Conclusion: In this series of successfully revascularized patients, ischemic core as estimated by RAPID-CTP-ASPECTS did not correlate with the baseline CT and tended to depict a larger infarct core than the infarct extent as assessed by 24h CT-ASPECTS.",
keywords = "Endovascular thrombectomy, Ischemic stroke, Large vessel occlusion, RAPID, Stroke imaging",
author = "Tsang, {Anderson Chun On} and Stephanie Lenck and Christopher Hilditch and Patrick Nicholson and Waleed Brinjikji and Timo Krings and Pereira, {Vitor M.} and Silver, {Frank L.} and Schaafsma, {Joanna D.}",
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T1 - Automated CT Perfusion Imaging Versus Non-contrast CT for Ischemic Core Assessment in Large Vessel Occlusion

AU - Tsang, Anderson Chun On

AU - Lenck, Stephanie

AU - Hilditch, Christopher

AU - Nicholson, Patrick

AU - Brinjikji, Waleed

AU - Krings, Timo

AU - Pereira, Vitor M.

AU - Silver, Frank L.

AU - Schaafsma, Joanna D.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Purpose: There is increasing use of automated computed tomography perfusion (CTP) to aid thrombectomy decision in emergent large vessel occlusion. It is important to understand the performance of these software packages in predicting ischemic core and tissue-at-risk in the real-world setting. The aim of this study was to evaluate whether ischemic core on non-contrast CT (NCCT) and automated CTP correspond and predict infarct extent after thrombectomy for ischemic stroke. Methods: Consecutive patients with acute anterior circulation large vessel occlusion undergoing successful thrombectomy (TICI 2b/3) were studied. All patients had baseline CT, CTP with RAPID post-processing software (RAPID-CTP), and post-thrombectomy 24 h CT. Ischemic cores were assessed by two blinded raters independently using the Alberta Stroke Program Early Computed Tomography Score (ASPECTS) on each modality. The interrater agreement for ASPECTS, and correlation between baseline CT-ASPECTS, RAPID-CTP-ASPECTS, and 24h CT-ASPECTS were calculated. Results: A total of 86 patients with a mean age of 70.3 years (SD 16.5) were studied. The median baseline CT-ASPECTS was 9.5 (interquartile range, IQR 8–10), median RAPID-CTP-ASPECTS was 9 (IQR 8–10), and mean RAPID-CTP-ischemic core volume was 14.4 ml (SD 27.9 ml). The mean mismatch volume (difference of Tmax > 6s and cerebral blood flow (CBF) < 30%) was 128.6 ml (SD 126.0 ml). There was substantial correlation between baseline and 24h CT-ASPECTS (rs: 0.62; p < 0.001), but poor correlation between RAPID-CTP-ASPECTS and RAPID-CTP ischemic core volume with 24h NCCT-ASPECTS (rs: 0.21; p = 0.06 and −0.16; p = 0.15 respectively). The positive predictive value of any established infarct for baseline CT-ASPECTS was 81%, while that of RAPID-CTP-ASPECTS was 64%. Conclusion: In this series of successfully revascularized patients, ischemic core as estimated by RAPID-CTP-ASPECTS did not correlate with the baseline CT and tended to depict a larger infarct core than the infarct extent as assessed by 24h CT-ASPECTS.

AB - Purpose: There is increasing use of automated computed tomography perfusion (CTP) to aid thrombectomy decision in emergent large vessel occlusion. It is important to understand the performance of these software packages in predicting ischemic core and tissue-at-risk in the real-world setting. The aim of this study was to evaluate whether ischemic core on non-contrast CT (NCCT) and automated CTP correspond and predict infarct extent after thrombectomy for ischemic stroke. Methods: Consecutive patients with acute anterior circulation large vessel occlusion undergoing successful thrombectomy (TICI 2b/3) were studied. All patients had baseline CT, CTP with RAPID post-processing software (RAPID-CTP), and post-thrombectomy 24 h CT. Ischemic cores were assessed by two blinded raters independently using the Alberta Stroke Program Early Computed Tomography Score (ASPECTS) on each modality. The interrater agreement for ASPECTS, and correlation between baseline CT-ASPECTS, RAPID-CTP-ASPECTS, and 24h CT-ASPECTS were calculated. Results: A total of 86 patients with a mean age of 70.3 years (SD 16.5) were studied. The median baseline CT-ASPECTS was 9.5 (interquartile range, IQR 8–10), median RAPID-CTP-ASPECTS was 9 (IQR 8–10), and mean RAPID-CTP-ischemic core volume was 14.4 ml (SD 27.9 ml). The mean mismatch volume (difference of Tmax > 6s and cerebral blood flow (CBF) < 30%) was 128.6 ml (SD 126.0 ml). There was substantial correlation between baseline and 24h CT-ASPECTS (rs: 0.62; p < 0.001), but poor correlation between RAPID-CTP-ASPECTS and RAPID-CTP ischemic core volume with 24h NCCT-ASPECTS (rs: 0.21; p = 0.06 and −0.16; p = 0.15 respectively). The positive predictive value of any established infarct for baseline CT-ASPECTS was 81%, while that of RAPID-CTP-ASPECTS was 64%. Conclusion: In this series of successfully revascularized patients, ischemic core as estimated by RAPID-CTP-ASPECTS did not correlate with the baseline CT and tended to depict a larger infarct core than the infarct extent as assessed by 24h CT-ASPECTS.

KW - Endovascular thrombectomy

KW - Ischemic stroke

KW - Large vessel occlusion

KW - RAPID

KW - Stroke imaging

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