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By Esther M. Morales, Michael B. Norris, Alice W. Schwarz, Edith W.Watts

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8)]. Parallel imaging methods suffer from an additional reduction in SNR-based on coil geometry. This additional reduction in SNR is characterized by what is called a g-factor. With current coil configurations and SNR limitations, the scan time reduction factors afforded by parallel imaging methods are on the order of 4–6. Parallel imaging methods are particularly effective when used with 3D CE-MRA where the SNR is sufficiently high to Contrast-enhanced MRA (CE-MRA) methods have gained widespread acceptance due to their ease of use, and their ability to quickly, reliably, and robustly produce high-quality diagnostic images of large vascular territories.

With a computer-controlled injector, the volume and injection rate are precisely programmed to ensure reproducible results. With manual injection, the clinician controls the injection and can better monitor the status of the patient. Imaging Sequence CE-MRA typically is performed using a three-dimensional, RF-spoiled, fast gradient-echo imaging sequence [21]. The 1 Basic Principles of MRI and MR Angiography 23 Fig. 25 Typical patient setup for a 3D CE-MRA acquisition of the renal arteries. An MRI-compatible computer-controlled injector is used to administer the gadolinium-based contrast material into a vein in the antecubital fossa.

Also, imaging parameters, including tip angle, may be adjusted to enhance signal differences. MR Image Formation To produce images in MRI, it is necessary to determine the origins of the signals so that they can be mapped to the appropriate positions in the image. This mapping of signal to position is accomplished by applying magnetic field gradients of predetermined amplitude and duration. To say that a magnetic field has a gradient means that it has a different strength at different locations in space.

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