Doubling mA while leaving all other factors the same does this to patient dose
What is double patient dose
100
This is typically done during head CTs to reduce exposure to the lens of the eyes
What is tilting the CT gantry or bringing the patients chin down
100
The ability of a CT system to maintain consistent HU values across a homogenous object
What is Uniformity
100
One advantage of using a power injector in CT
What is consistent flow, technologist does not need to be in the room, can inject faster than by hand.
100
This type of tube/detector movement was used for both 1st and 2nd generation scanners
What is translate/rotate
200
Increasing kVp while keeping all factors the same has this effect on dose in CT
What is increases dose. However this is different than in traditional radiography as kVp does not have a linear relationship with dose and permits more photon penetration.
200
The quantity of blood pumped out of a ventricle in every heart beat
What is ejection fraction
200
A decrease in this factor will increase image size without reducing image resolution
What is Display Field of View (DFOV)
200
The maximum amount of IV contrast a pediatric patient should receive in a 24 hour period in mg/kg
What is 3 mg/kg
200
This device made helical scanning a possibility for the first time
What are slip rings
300
This dose reduction technique changes the dose output by the tube during exposure to match the patients body habitus
What is mA modulation or active tube current modulation
300
The position that is best for CT evaluation of the Chest
What is Supine
300
The role of CT during a PET-CT fusion exam
What is provide location information or attenuation correction for PET images
300
Contrast with this Osmolality is rarely used today because of its increased risk of adverse contrast reactions
What is High Osmolar Contrast Medium (HOCM)
300
This scanner generation is characterized by a fan beam and a stationary circular detector
What is a 4th Generation CT scanner
400
This material can be used for breast shields
What is Bismuth
400
The normal range for adult systolic blood pressure
What is 95-140mm Hg
400
Section widths of this type are used to reduce partial volume averaging
What are thin section widths
400
The Excretion Half-Time of Intravenous Iodinated Contrast Media in a patient with normal renal function
What is 1 to 2 hours
400
This scanner generation does not have a traditional x-ray tube and is used primarily for cardiac imaging
What is a 5th Generation scanner
500
These two values are output by the CT scanner and approximate the dose the patient recieved
What are CTDIvol and DLP
500
This is the reason for most CT brain profusions scans
What is evaluate ischemic stroke
500
Difficult: 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 2.5mm, what is the volume of each voxel?
What is 1.85 mm cubed
500
These 3 lab values assess patients kidney function before the administration of IV contrast
What are, BUN, Creatinine, GFR
500
A ring artifact is possible on this scanner generation