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