Imaging of the Hip & Bony Pelvis by A. Mark Davies, Karl J. Johnson, Richard William Whitehouse,
By A. Mark Davies, Karl J. Johnson, Richard William Whitehouse, A.L. Baert
This is a accomplished textbook on imaging of the bony pelvis and hip joint that gives an in depth description of the recommendations and imaging findings suitable to this complicated anatomical area. within the first a part of the ebook, a few of the options and systems hired for imaging the pelvis and hip are mentioned intimately. the second one a part of the booklet records the applying of those ideas to the varied medical difficulties and ailments encountered. one of several subject matters addressed are congenital and developmental problems together with developmental dysplasia of the hip, irritable hip and septic arthritis, Perthes' illness and avascular necrosis, slipped top femoral epiphysis, bony and gentle tissue trauma, arthritis, tumours and hip prostheses. every one bankruptcy is written by way of an said specialist within the box, and a wealth of illustrative fabric is integrated. This booklet could be of serious worth to musculoskeletal and normal radiologists, orthopaedic surgeons and rheumatologists.
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Additional info for Imaging of the Hip & Bony Pelvis
Additionally, the number of acquisitions should be as high as possible. 3 Spatial Resolution The spatial resolution is the ability to distinguish between two points and it improves as voxel size decreases. Separate tissues within the same voxel are not separately visualized on the MR image but separate tissues in adjacent voxels are differentiated. When a voxel contains more than one type of tissue, the signal intensity of that voxel is the average of the 33 signal intensities of the individual tissues and this results in partial volume averaging.
Fat, however, which has a very short T1, demonstrates high signal intensity. T1-SE in the hip is used primarily for evaluation of bone marrow disorders such as avascular necrosis and detecting fractures or overuse syndromes (Fig. 4). 2 T2-Weighted Spin Echo Sequence T2-weighted spin echo images (T2-SE) are obtained with a relatively long TR to minimize T1 saturation effects. The echo time TE is chosen to show differences in the T2 relaxation times. This occurs at echo times of around 60–100 ms.
In most imaging systems the matrix size is limited to a power of 2, or multiples of 64. The number of phase encodings is flexible, and can be given any number equal or less to the matrix size. Based on Eq. 1 any desired resolution can be achieved (Fig. 2). For practical reasons, however, limitations exist with respect to the selection of the parameters which are described in the following: x FOVread: the ﬁeld of view in the read direction must be selected to cover the region of interest. Due to the low-pass ﬁ ltering properties in the frequency encoding direction there is no wraparound artifact even if the object is larger than the FOV.