The role of high-resolution imaging has generally been discernible in the image. The use of this concept holds potential limited because of the associated loss of signal-to-noise ratio (SNR) for defining the appropriate imaging parameters to allow an object as voxel size decreases and imaging time increases. Despite these to be distinguished from its surroundings.
truths, we show that high-resolution imaging methods can be used
We consider the need for high resolution in the areas of MRA, to perform better magnetic resonance angiography (MRA), enhance lesion detection, and depiction of intracranial structures such as visibility of small structures, and allow better image interpolation. Spethe hippocampal formation. We also consider the role played by cifically, we show that very small vessels can be seen with convenhigh resolution in improving image interpolation required for tional MRA methods, and small lesions on the order of a few cubic creating arbitrary-angle MR angiograms, which are useful for millimeters can be seen with a single dose of gadolinium diethyltriaminepentaacetic acid, and structures such as the hippocampal forma-visualizing blood vessels with complicated geometry.
tion are best depicted when a high-resolution three-dimensional
The ability to push resolution to its limits is important in high-(3D) imaging method is used. We also show that image interpolation resolution intracranial MRA [2][3][4]. We examine the use of long for the 3D visualization of structures with complicated geometry is sampling times coupled with asymmetric echo acquisitions in the best accomplished with a fractional voxel evaluation using the Fourier read direction to collect high-resolution data for observing small transform shift theorem on high-resolution images. We demonstrate vessels. Partial-Fourier (PF) image reconstruction on these asymthat the expression for visibility, CNR p, can be used to establish metrically collected echoes is used to improve resolution further the optimal resolution to see a given structure. CNR refers to the [5]. T 1 -weighted three-dimensional (3D) imaging with a T 1contrast-to-noise ratio and p is the number of voxels occupied by reducing contrast agent for detecting small lesions also benefits the object in the image. The optimal resolution is determined from from the approach of using high resolution. Imaging of multifocal theoretical curves of visibility as a function of voxel size relative to object size. We also demonstrate the enhancement of small vessel lesions and the need (or lack thereof) for a higher dose of contrast visibility on individual images and maximum-intensity projection imagent are considered when images with isotropic voxels are obages with voxel sizes as small as 0.29 mm using 1024 sampled points tained. High-resolution imaging is also important for visualizing in the readout direction. Using 3D visibility arguments, it is predicted small structures such as the intracranial nerves and the structural that under the right conditions, objects of interest much smaller than detail of the hippocampal formation. Finally, image interpolation the voxel size can be seen on conventional MR images. แญง 1997 John benefits obtained from an extension to a smaller effective voxel