PMID- 1569866
OWN - NLM
STAT- MEDLINE
DCOM- 19920528
LR  - 20190824
IS  - 0740-3194 (Print)
IS  - 0740-3194 (Linking)
VI  - 24
IP  - 2
DP  - 1992 Apr
TI  - A data adaptive reprojection technique for MR angiography.
PG  - 262-74
AB  - Inability to detect vessel overlap and vascular loops can compromise the 
      interpretation of magnetic resonance angiograms. A data-adaptive ray tracing 
      (DART) technique was developed to produce the appropriate variations in signal 
      intensity at points of vessel overlap in order to simulate the standard 
      angiographic representation of vessels. In this technique a threshold is utilized 
      to identify vessels in the image slices composing a 3D angiographic data set. A 
      mask, which defines regions slightly larger than the vessel boundaries, is 
      obtained by blurring the vessel information surviving the initial threshold. This 
      mask is converted to binary form prior to multiplication by the original 
      angiographic data set. Following application of an additional threshold to the 
      masked data, line integrals through the regions defined by the mask are performed 
      to obtain an angiographic signal proportional to the integrated vessel signal as 
      in conventional angiography. This integrated reprojection is then uniquely 
      combined with a maximum intensity pixel (MIP) reprojection to produce the final 
      DART image. The application of the DART technique to 2D time-of-flight and 3D 
      phase-contrast angiograms successfully enabled the identification of over-lapping 
      vessels and vascular loops. DART was also found to produce less vessel narrowing 
      than the MIP technique.
FAU - Korosec, F R
AU  - Korosec FR
AD  - Department of medical Physics, University of Wisconsin, Madison 53792.
FAU - Weber, D M
AU  - Weber DM
FAU - Mistretta, C A
AU  - Mistretta CA
FAU - Turski, P A
AU  - Turski PA
FAU - Bernstein, M A
AU  - Bernstein MA
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Magn Reson Med
JT  - Magnetic resonance in medicine
JID - 8505245
SB  - IM
MH  - *Algorithms
MH  - Blood Vessels/*anatomy & histology
MH  - Humans
MH  - Image Enhancement/methods
MH  - *Image Processing, Computer-Assisted
MH  - Magnetic Resonance Imaging/*methods
EDAT- 1992/04/01 00:00
MHDA- 1992/04/01 00:01
CRDT- 1992/04/01 00:00
PHST- 1992/04/01 00:00 [pubmed]
PHST- 1992/04/01 00:01 [medline]
PHST- 1992/04/01 00:00 [entrez]
AID - 10.1002/mrm.1910240208 [doi]
PST - ppublish
SO  - Magn Reson Med. 1992 Apr;24(2):262-74. doi: 10.1002/mrm.1910240208.