MEDRADSC 3DA3 Lecture Notes - Lecture 6: Sedation, Coronary Artery Disease, Cath Database
27 Feb 2018
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Document Summary
Challenges of imaging the heart: small vessels: require good spatial resolution, motion: requires good temporal resolution (ability to see things in a moment in time) What do you think are the key functional scanner requirements: small slices, small/isotropic, fast scanner, 0. 3 seconds or less is best, more detector rows (minimum 64 slices, less medication for the patient to be stable) In each rotation, 64-slices are produced, giving approximately (64x3)192 slices per second, 120 mm coverage: ecg-gated cardiac hardware, cardiac analysis software and hardware, radiologist and/or cardiologist with appropriate training, dual head injector (contrast) required. If we use half a rotation, we cut the acquisition time of each image in half better temporal resolution: 0. 15 seconds. Dose modulation: axial- xray on during diastole only, helical- xray on for entire scan length, unadjusted dose can be 11 to 22msv, conventional cardiac angiography approx.
