CT
Initially C.T. took approximately how long to demonstrate one slice of anatomy?
15min
When was the CT invented?
1972
When did 3-D CT fully evolve?
1980's
A CT abdomen is equivalent to __________ of background radiation
3 years
Which of the following is the most advanced usable generation of CT scanners? Pencil x-ray beam 30 detector Fan x-ray beam 360 detector fan x-ray beam Electron beam
360 detector fan x-ray beam
The approximate weight limit for having a C.T. scan is?
450-475lbs
What separated the fourth generation CT scanners from the others was: Allows physicians to produce high resolution images of moving organs A bank of detectors completely surrounded the patient in a full circle within the gantry The scan time The decreased amount of contrast needed
A bank of detectors completely surrounded the patient in a full circle within the gantry
Which of these would be a patient who needs an intracranial head image in CT? Acute stroke patient Patient with sinus disease Patient with chronic headaches Both A & C Both A & B
Both A & C
IV contrast evaluates the ____ and oral contrast is used to highlight the ____. Digestive organs, excretory systems Excretory system, digestive system None of the above
Excretory system, digestive system
Who were the Nobel Award winning inventors of the CT scanner?
Hounsfield & Cormack
MPR stands for
Multiplanar Reconstruction
Using nuclear medicine in conjunction with CT equipment is called:
PET imaging
What exam became obsolete due to CT head imaging?
Pneumoencephalography
It is important to communicate all of the following with the patient prior to the scan EXCEPT: need to remain still What to expect The protocol to be used Breathing instruction
The protocol to be used
Computed Tomography replaced what?
Traditional Linear Tomography Images
What is the initial image taken in CT called? Survey Scout Topogram All of the above
all of the above
The main parts of the operators console include all of the following except: Keyboard Mouse Aperture Monitor
aperture
Brain tissue possesses a natural barrier to passage of certain substances which is termed the
blood brain barrier
What was CT/CAT originally called?
body scanner
Sections at right angles along any point of the longitudinal axis of the body or its parts is: Longitudinal Transverse Axial Both b & c
both b & c
3-D CT is especially helpful in planning: Radiation therapy treatments Biopsies Surgical repair of extremities Craniofacial surgery Both c and d
both c & d
A power injector is used to inject contrast at a __________ rate.
continuous
What term is used to describe the type of anatomy that is demonstrated in CT?
cross-sectional
Which is seen without contrast? Tumor Stroke Aneurysm Dementia
dementia
How many generations of CT scanners have developed since 1975?
five
Axial scans are viewed as though the viewer were facing the patient and looking at the scan from the ______________ end of the patient
foot
The appearance of blood on a CT image is
gray
CT was originally dedicated to perform what imaging procedure?
headwork
Newer CT scanners use a system that rotates around the body, but never touches the start and end points known as:
helical/spiral
Contrast is used in CT for all of the following exams except: Tumor Abscess Edema Aneurysm Hydrocephalus
hydrocephalus
0.5:1 pitch would result in _______________dose due to over sampling the anatomy
increased
The highest amount of dose from a CT scan is located
next to the patient
What type of beam obtained 1st generation CT images?
pencil-thin beam
The parameters of a CT scan are often called
protocol
Why is the gantry angled for some head exams?
reduce radiation exposure
_________________ determines discrepancies in extremity lengths and repeated exams are common if corrective surgical procedures are performed.
scanogram
The higher the pitch, the ______ the scan time
shorter
'Pitch' in the context of CT is
the speed of the table movement
What term in Greek means slice?
tomos
All of the following are disciplines used for PET imaging EXCEPT? MRI Nuclear Medicine Ultrasound CT
ultrasound
Low-density structures will attenuate _____________ x-ray beam
very little
The three dimensional tissue volume element is the
voxel
The CT baseline is referenced with
water-0
Image contrast is controlled by __________.
window width
