By Geoffrey D. Rubin MD, Neil M. Rofsky MD
Written by way of world-renowned specialists in either CT angiography and MR angiography, this landmark paintings is the 1st finished textual content on vascular imaging utilizing CT and MR. It presents a balanced view of the services of those modalities and useful directions for acquiring and reading pictures. greater than 2,200 illustrations supplement the text.
Chapters co-authored by means of CT and MR professionals hide imaging of all coronary and non-coronary arteries and veins. every one bankruptcy info symptoms, imaging thoughts, basic and variation anatomy, illnesses, surgical administration, and pitfalls. The authors evaluate the software of CT and MR in particular scientific occasions and speak about the position of traditional angiography and ultrasound the place appropriate.
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Extra info for CT and MR Angiography: Comprehensive Vascular Assessment
Toshiba suggests preferred pitch factors, for 2 4 6 8 10 z FIGURE 1-24 Principle of raw data interpolation and resulting section sensitivity profiles (SSP). Interpolation between spiral trajectories (tube to detector) with 360-degree LI interpolation at pitch 1 increases section width (SW) by 28% over section collimation (SC) (A). Interpolation between spiral trajectories and conjugated trajectories (detector to tube) with 180-degree LI interpolation ensures that SW and SC are identical at pitch 1(B).
Note that the effects of varying degrees of overlap between sections leads to a more complex curve for multidetector-row CT. (From M. Prokop et al. Spiral and Multislice CT of the Body. ) Overscanning or over-ranging refers to the fact that image reconstruction requires approximately one rotation before and one rotation after the planned scan range in order to be able to properly interpolate and reconstruct crosssectional images from the raw data (10). The amount of overscanning depends on the pitch factor, section collimation, number of detector rows, and the raw data reconstruction technique.
Qxd 03/19/2008 08:52 Page 15 Aptara Inc. Chapter 1 | Principles of Computed Tomographic Angiography The only exception to this rule is a scanner that uses 32 active detector rows and z-flying focal spot technology (Fig. 1-17C). 2 mm. While this scanner actually provides a maximum of 32 sections per rotation (in the nonspiral, or sequence, mode), the manufacturer has opted for calling it a 64-slice scanner because the z-flying focal spot technology effectively doubles the data points (and thus the simultaneously acquired slices) along the patient axis without having to increase the number of detector rows.