PMID- 18666099
OWN - NLM
STAT- MEDLINE
DCOM- 20081114
LR  - 20211020
IS  - 1522-2594 (Electronic)
IS  - 0740-3194 (Print)
IS  - 0740-3194 (Linking)
VI  - 60
IP  - 2
DP  - 2008 Aug
TI  - Simulation of relative temporal resolution of time-resolved MRA sequences.
PG  - 398-404
LID - 10.1002/mrm.21658 [doi]
AB  - Time-resolved MRA sequences are typically characterized by the display frame 
      rate. However, true temporal resolution should be defined in a manner analogous 
      to spatial resolution; it is not the ability of a sequence to update rapidly but 
      rather the ability to discern changes that occur within a small time that should 
      characterize temporal resolution. For view-shared methods like Keyhole and 
      time-resolved imaging of contrast kinetics (TRICKS), regions of k-space from 
      multiple time frames are combined to form a single reconstructed time frame. This 
      often causes the time needed to acquire all k-space data points to be 
      significantly longer than the displayed frame time, resulting in a poor frequency 
      response. Simulated here are the temporal impulse response and temporal frequency 
      response (TFR) curves of three time-resolved MRA methods, including the recently 
      introduced highly-constrained backprojection local reconstruction (HYPR LR) 
      method. It is found that the HYPR LR reconstruction method exhibits a better TFR 
      for a larger spectrum of temporal and spatial frequencies than the Keyhole and 
      TRICKS methods.
CI  - (c) 2008 Wiley-Liss, Inc.
FAU - Keith, L
AU  - Keith L
AD  - Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin, USA. 
      keith@wisc.edu
FAU - Kecskemeti, S
AU  - Kecskemeti S
FAU - Velikina, J
AU  - Velikina J
FAU - Mistretta, C
AU  - Mistretta C
LA  - eng
GR  - R01 HL072260/HL/NHLBI NIH HHS/United States
GR  - R01 HL072260-01/HL/NHLBI NIH HHS/United States
GR  - 1R01HL72260-01/HL/NHLBI NIH HHS/United States
PT  - Evaluation Study
PT  - Journal Article
PT  - Research Support, N.I.H., Extramural
PL  - United States
TA  - Magn Reson Med
JT  - Magnetic resonance in medicine
JID - 8505245
SB  - IM
MH  - *Algorithms
MH  - Computer Simulation
MH  - Humans
MH  - Image Enhancement/methods
MH  - Image Interpretation, Computer-Assisted/*methods
MH  - Magnetic Resonance Angiography/*methods
MH  - *Models, Cardiovascular
MH  - *Models, Neurological
MH  - Reproducibility of Results
MH  - Sensitivity and Specificity
PMC - PMC2613762
MID - NIHMS64984
EDAT- 2008/07/31 09:00
MHDA- 2008/11/15 09:00
PMCR- 2009/08/01
CRDT- 2008/07/31 09:00
PHST- 2008/07/31 09:00 [pubmed]
PHST- 2008/11/15 09:00 [medline]
PHST- 2008/07/31 09:00 [entrez]
PHST- 2009/08/01 00:00 [pmc-release]
AID - 10.1002/mrm.21658 [doi]
PST - ppublish
SO  - Magn Reson Med. 2008 Aug;60(2):398-404. doi: 10.1002/mrm.21658.