Sensitivity of mean transit time estimates to model conditioning and data availability

2011 ◽  
Vol 25 (6) ◽  
pp. 980-990 ◽  
Author(s):  
M. Hrachowitz ◽  
C. Soulsby ◽  
D. Tetzlaff ◽  
I. A. Malcolm
Keyword(s):  
Transit Time ◽  
Mean Transit Time ◽  
Data Availability ◽  
Time Estimates

Cerebral vascular mean transit time determined by PET and DSC-MRI

2005 ◽  
Vol 25 (1_suppl) ◽  
pp. S676-S676
Author(s):  
Masanobu Ibaraki ◽  
Hiroshi Ito ◽  
Eku Shimosegawa ◽  
Hideto Toyoshima ◽  
Keiichi Ishigame ◽  
...  
Keyword(s):  
Transit Time ◽  
Mean Transit Time ◽  
Dsc Mri ◽  
Cerebral Vascular

scholarly journals Interception effects on stable isotope driven streamwater transit time estimates

2015 ◽  
Vol 42 (13) ◽  
pp. 5299-5308 ◽  
Author(s):  
Michael P. Stockinger ◽  
Andreas Lücke ◽  
Jeffrey J. McDonnell ◽  
Bernd Diekkrüger ◽  
Harry Vereecken ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Transit Time ◽  
Time Estimates

Reproducibility of mean transit time for maximal myocardial flow assessment by videodensitometry

1990 ◽  
Vol 6 (2) ◽  
pp. 101-108 ◽  
Author(s):  
Nico H. J. Pijls ◽  
Gerard J. H. Uijen ◽  
Truus Pijnenburg ◽  
Karel van Leeuwen ◽  
Wim R. M. Aengevaeren ◽  
...  
Keyword(s):  
Transit Time ◽  
Mean Transit Time ◽  
Myocardial Flow

scholarly journals Serial Quantitative Computed Tomography Perfusion in Aneurysmal Subarachnoid Hemorrhage

2016 ◽  
Vol 43 (3) ◽  
pp. 375-380 ◽  
Author(s):  
Cheemun Lum ◽  
Matthew J. Hogan ◽  
John Sinclair ◽  
Shane English ◽  
Howard Lesiuk ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Subarachnoid Hemorrhage ◽  
Middle Cerebral Artery ◽  
Transit Time ◽  
Cerebral Artery ◽  
Computed Tomography Angiography ◽  
Aneurysmal Subarachnoid Hemorrhage ◽  
Mean Transit Time ◽  
Arterial Diameter ◽  
Computed Tomography Perfusion

AbstractPurpose: Computed tomography perfusion (CTP) has been performed to predict which patients with aneurysmal subarachnoid hemorrhage are at risk of developing delayed cerebral ischemia (DCI). Patients with severe arterial narrowing may have significant reduction in perfusion. However, many patients have less severe arterial narrowing. There is a paucity of literature evaluating perfusion changes which occur with mild to moderate narrowing. The purpose of our study was to investigate serial whole-brain CTP/computed tomography angiography in aneurysm-related subarachnoid hemorrhage (aSAH) patients with mild to moderate angiographic narrowing. Methods: We retrospectively studied 18 aSAH patients who had baseline and follow-up whole-brain CTP/computed tomography angiography. Thirty-one regions of interest/hemisphere at six levels were grouped by vascular territory. Arterial diameters were measured at the circle of Willis. The correlation between arterial diameter and change in CTP values, change in CTP in with and without DCI, and response to intra-arterial vasodilator therapy in DCI patients was evaluated. Results: There was correlation among the overall average cerebral blood flow (CBF; R=0.49, p<0.04), mean transit time (R=–0.48, p=0.04), and angiographic narrowing. In individual arterial territories, there was correlation between changes in CBF and arterial diameter in the middle cerebral artery (R=0.53, p=0.03), posterior cerebral artery (R=0.5, p=0.03), and anterior cerebral artery (R=0.54, p=0.02) territories. Prolonged mean transit time was correlated with arterial diameter narrowing in the middle cerebral artery territory (R=0.52, p=0.03). Patients with DCI tended to have serial worsening of CBF compared with those without DCI (p=0.055). Conclusions: Our preliminary study demonstrates there is a correlation between mild to moderate angiographic narrowing and serial changes in perfusion in patients with aSAH. Patients developing DCI tended to have progressively worsening CBF compared with those not developing DCI.

Probable range for whole kidney mean transit time values determined by reexamination of UK audit studies

2008 ◽  
Vol 29 (11) ◽  
pp. 1006-1014 ◽  
Author(s):  
Cyril C. Nimmon ◽  
John S. Fleming ◽  
Martin Šámal
Keyword(s):  
Transit Time ◽  
Mean Transit Time

scholarly journals The Effects of Changes in PaCO2Cerebral Blood Volume, Blood Flow, and Vascular Mean Transit Time

Stroke ◽  
1974 ◽  
Vol 5 (5) ◽  
pp. 630-639 ◽  
Author(s):  
ROBERT L. GRUBB ◽  
MARCUS E. RAICHLE ◽  
JOHN O. EICHLING ◽  
MICHEL M. TER-POGOSSIAN
Keyword(s):  
Blood Flow ◽  
Blood Volume ◽  
Transit Time ◽  
Mean Transit Time ◽  
Volume Blood ◽  
Volume Blood Flow
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