CT REGISTRY questions with correct answers

What determines how much and what section of the collected raw data is used to create an image CORRECT ANSWER Display field of view The "string of beads" artifact is most closely associated with which of the following? CORRECT ANSWER Maximum intensity projection images A patient has a severe vagal reaction to iodinated contrast material that includes bradycardia should be given a treatment of CORRECT ANSWER *treatment includes increasing blood pressure with IV fluids *intravenous administration of atropine to block vagal stimulation of the heart An MDCT image is reconstructed using a 512x512 matrix and a display field of view of 44 cm. If the detector collimation is set to a section width of 2.5 mm what is the volume of each voxel CORRECT ANSWER How to solve: The linear dimension of the pixel must first be calculated by dividing the DFOV, in mm, by the matrix. This linear pixel dimension is squared to yield the pixel area in mm^2. The volume of the voxel may be calculated by multiplying the pixel area by the section width step 1. 44 cm/ 512 =0.0859 step 2. 0.0859*2.5 mm = 0.2148 step 3. move the decimal point =2.15