TY  - BOOK
AU  - Subha G R (93514002)
TI  - Phase contrast magnetic resonance angiogram: flow and direction information
KW  - COMPUTING METHODOLOGIES
KW  - COMPUTER GRAPHICS
KW  - IMAGE MANIPUTATION
KW  - IMAGE PROCESSING
N1  - Mini Project Report, Mphill CS
N2  - 
Magnetic Resonance Angiography is a group of techniques based on Magnetic resonance Imaging to image blood vessels. Phase-Contrast Magnetic Resonance Angiography is one of the flow dependent imaging techniques which utilize phase difference to distinguish blood from static tissue. This method encodes the velocity of moving blood in magnetic resonance signal’s phase. Phase-Contrast Magnetic Resonance methods are based on transverse magnetization of spins that move in the presence of magnetic field gradients, obtaining a phase different from that for static spins. In this report, we discuss how gradient echo imaging is deployed using additional velocity encoding gradients to compute blood flow MIPs using Maximum Intensity Projections. Phase difference calculated on the images acquired using bipolar encoding gradients with opposite polarity is known to eliminate the effect of background effects and enable quantitative assessment of flow. In this report, we undertake a numerical study to compare different flow reconstruction methods used in PC - MRA. The Four-point method is implemented to compute CD speed and obtain flow information in all the three directions. The computational steps are illustrated using two volunteer data sets. The flow information in the x, y and z direction is obtained by analyzing the brighter regions. The histogram specifies the directional flow
ER  -