Dynamic perfusion CT: optimizing the temporal resolution for the calculation of perfusion CT parameters in stroke patients.
OBJECTIVE
To assess the influence of different temporal sampling rates on the accuracy of the results from cerebral perfusion CTs in patients with an acute ischemic stroke.


METHODS
Thirty consecutive patients with acute stroke symptoms received a dynamic perfusion CT (LightSpeed 16, GE). Forty millilitres of iomeprol (Imeron 400) were administered at an injection rate of 4 ml/s. After a scan delay of 7s, two adjacent 10mm slices at 80 kV and 190 mA were acquired in a cine mode technique with a cine duration of 49 s. Parametric maps for the blood flow (BF), blood volume (BV) and mean transit time (MTT) were calculated for temporal sampling intervals of 0.5, 1, 2, 3 and 4s using GE's Perfusion 3 software package. In addition to the quantitative ROI data analysis, a visual perfusion map analysis was performed.


RESULTS
The perfusion analysis proved to be technically feasible with all patients. The calculated perfusion values revealed significant differences with regard to the BF, BV and MTT, depending on the employed temporal resolution. The perfusion contrast between ischemic lesions and healthy brain tissue decreased continuously at the lower temporal resolutions. The visual analysis revealed that ischemic lesions were best depicted with sampling intervals of 0.5 and 1s.


CONCLUSIONS
We recommend a temporal scan resolution of two images per second for the best detection and depiction of ischemic areas.
Kämena
Andreas
A
Department of Radiology, Charité-Medical University Berlin, Augustenburger Platz 1, D-13353 Berlin, Germany. andreas.kaemena@charite.de
Streitparth
Florian
F
Grieser
Christian
C
Lehmkuhl
Lukas
L
Jamil
Basil
B
Wojtal
Katarzyna
K
Ricke
Jens
J
Pech
Maciej
M
D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D002545:Brain Ischemia / Q000000981:diagnostic imaging*; D006801:Humans; D008875:Middle Aged; D010477:Perfusion / Q000379:methods; D011856:Radiographic Image Enhancement / Q000379:methods; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020521:Stroke / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*