PMID- 7651113
OWN - NLM
STAT- MEDLINE
DCOM- 19950925
LR  - 20220311
IS  - 0740-3194 (Print)
IS  - 0740-3194 (Linking)
VI  - 33
IP  - 6
DP  - 1995 Jun
TI  - In vivo validation of magnetic resonance blood volume flow measurements with 
      limited spatial resolution in small vessels.
PG  - 778-84
AB  - The accuracy of magnetic resonance phase contrast volume flow measurements in 
      small blood vessels is expected to be smaller than in large vessels, because of 
      partial volume effects at the vessel boundary. Accuracy was validated in the dog 
      femoral artery, diameter 3.5 +/- 0.7 mm, using an ultrasonic transit-time 
      flowmeter (TT). The number of pixels per vessel diameter (ND) ranged from 1.6 to 
      4.8. The vessel cross-section was determined using a threshold in the magnitude 
      image. Between the two methods the correlation coefficient was 0.95 (range 10-200 
      ml/min). The proportional difference (PD), (QTT-QMR)/1/2(QTT+QMR), was 0.8%, 
      showing no systematic difference between the methods. The PDs standard deviation 
      was 27%, and 19% for flow rates above 30 ml/min. Only a significant decrease of 
      the PDs variance was found at the highest ND values, suggesting other sources of 
      error than partial volume effects. It is concluded that with an ND value of about 
      3, accurate blood volume flow rates can be determined.
FAU - Hofman, M B
AU  - Hofman MB
AD  - Department of Physiology, Free University, Amsterdam, The Netherlands.
FAU - Visser, F C
AU  - Visser FC
FAU - van Rossum, A C
AU  - van Rossum AC
FAU - Vink, Q M
AU  - Vink QM
FAU - Sprenger, M
AU  - Sprenger M
FAU - Westerhof, N
AU  - Westerhof N
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Magn Reson Med
JT  - Magnetic resonance in medicine
JID - 8505245
SB  - IM
MH  - Animals
MH  - *Blood Flow Velocity
MH  - *Blood Volume
MH  - Dogs
MH  - Femoral Artery/*physiology
MH  - Hemorheology
MH  - *Magnetic Resonance Imaging
MH  - Rheology
EDAT- 1995/06/01 00:00
MHDA- 1995/06/01 00:01
CRDT- 1995/06/01 00:00
PHST- 1995/06/01 00:00 [pubmed]
PHST- 1995/06/01 00:01 [medline]
PHST- 1995/06/01 00:00 [entrez]
AID - 10.1002/mrm.1910330606 [doi]
PST - ppublish
SO  - Magn Reson Med. 1995 Jun;33(6):778-84. doi: 10.1002/mrm.1910330606.