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Processing and Interpretation Times of CT Angiogram and CT Perfusion in Stroke

Published online by Cambridge University Press:  02 December 2014

Ashok Srinivasan ,
Mayank Goyal ,
Cheemun Lum ,
Thanh Nguyen  and
William Miller
Ashok Srinivasan
Affiliation:
Department of Diagnostic Imaging, The Ottawa Hospital, Ottawa, Canada
Mayank Goyal*
Affiliation:
Department of Diagnostic Imaging, The Ottawa Hospital, Ottawa, Canada
Cheemun Lum
Affiliation:
Department of Diagnostic Imaging, The Ottawa Hospital, Ottawa, Canada
Thanh Nguyen
Affiliation:
Department of Diagnostic Imaging, The Ottawa Hospital, Ottawa, Canada
William Miller
Affiliation:
Department of Diagnostic Imaging, The Ottawa Hospital, Ottawa, Canada
*
Division of Neuroradiology, Department of Diagnostic Imaging, The Ottawa Hospital, Civic Campus, Ottawa, Ontario, Canada K1Y 4E9
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Abstract:

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Objective:

To determine the mean time for acquiring computed tomogram perfusion (CTP) and CT angiogram (CTA) images in acute stroke. To determine and compare processing and interpretation times amongst three groups of radiologists with varying degree of expertise: two radiology residents (Group I), two neuroradiology fellows (Group II) and four consultant neuroradiologists (Group III).

Methods:

The mean time of acquisition of CTA and CTP studies was calculated among ten patients presenting with acute stroke. All readers had to process the CTA and CTP images, interpret them (for presence or absence of thrombus and penumbra) and save them on the GE Advantage Windows workstation. The mean time for processing and interpreting these studies was calculated.

Results:

The mean time for acquisition of CTA and CTP studies in the ten patients was 14.6 ± 5.9 minutes. The time taken for CTA processing and interpretation in Groups I, II and III was 2.3 ± 1.3 min, 1.6 ± 0.4 min and 1.5 ± 0.7 min respectively. The time required for CTP processing and interpretation by the same groups was 5.2 ± 1.7 min, 4.5 ± 1.5 min and 4.1 ± 1.1 min respectively. There was a statistically significant difference of means between Groups I and III in the CTA and CTP processing and interpretation times (p=0.02, p=0.01 respectively) but no statistical difference between Groups I and II (p=0.15, p=0.22 respectively) or Groups II and III (p=0.31, p=0.30 respectively).

Conclusion:

The CTA and CTP studies can be performed, processed and interpreted quickly in acute stroke.

Résumé:

RÉSUMÉ:Objectif:

Déterminer le temps moyen d’acquisition des images au moyen du CT avec perfusion (CTP) et de l’angiographie CT (CTA) dans l’accident vasculaire cérébral aigu (AVCA). Déterminer et comparer le temps de traitement et d’interprétation par trois groupes de radiologistes ayant un degré d’expertise variée: 2 résidents en radiologie (groupe I), 2 étudiants gradués en neuroradiologie (groupe II) et 4 neuroradiologistes consultants (groupe III).

Méthodes:

Le temps moyen d’acquisition des images par CTA et CTP a été calculé chez dix patients porteurs d’un AVC aigu. Tous les radiologistes devaient traiter les images CTA et CTP, les interpréter pour déterminer la présence ou l’absence de thrombus ou de pénombre et les enregistrer sur la station de travail Advantage Windows Workstation de GE. Le temps moyen de traitement et d’interprétation de ces études a été calculé.

Résultats:

Le temps moyen d’acquisition des études CTAet CTP chez les dix patients était de 14,6 ± 5,9 minutes. Le temps de traitement et d’interprétation des images obtenues par CTA dans les groupes I, II et III était de 2,3 ± 1,3 minutes, 1,6 ± 0,4 minutes et 1,5 ± 0,7 minutes respectivement. Le temps de traitement et d’interprétation des images obtenues par CTP était de 5,2 ± 1,7 minutes, 4,5 ± 1,5 minutes et 4,1 ±1,1 minutes respectivement. Il y avait une différence significative au point de vue statistique entre les moyennes des groupes I et III pour le temps de traitement et d’interprétation (p = 0,02 et p = 0,01 respectivement), mais pas de différence entre les groupes I et II (p = 0,15 et p = 0,22 respectivement), ou les groupes II et III (p = 0,31 et p = 0,30 respectivement).

Conclusion:

Les études par CTA et CTP peuvent être effectuées, traitées et interprétées rapidement dans l’AVCA.

Type
Original Article
Information
Canadian Journal of Neurological Sciences , Volume 32 , Issue 4 , November 2005 , pp. 483 - 486
Copyright
Copyright © The Canadian Journal of Neurological 2005

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