MEDRADSC 3DA3 Lecture Notes - Lecture 1: Subdural Hematoma, Visual Artifact, Aorta
3 Feb 2020
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Document Summary
Benefits: higher image quality, beam geometry, table remains stationary during image capture. Pitfalls: pausing in scanning adds to total scan time, difficult patient, contrast filled vessels, large breathing time required, slice misregistration, affect on data reconstruction (mprs) Helical scanning: greatly enhanced the diagnostic capabilities of ct, shorter scan times, to assess intracranial aneurysms, arterio-venous malformations and carotids, superior quality of reformatted images. Two components: radiation detector, support electronics data acquisition system, can range 4, 16, 32, 40, 64, 256, 320. Data acquisition: understand how data is acquired in single slice detector, pre collimation is only way to define slice thickness, only one detector wide. Image quality is affected by beam collimation, slice thickness and pitch: defines how much scatter will reach the ir, snr and pitch impacts image quality based on amount of info acquired. Collimation in mdct: collimation ill fall on entire multirow of detectors, the larger the number of detectors the greater the volume coverage.
