CT Final

CT system components consist of all the following except:

Slip ring technology eliminated the need for stopping rotation during scanning.

Detectors functions is what?

Prior to the exam you should do all except:

What gauge does an IV need to be for CT injections?

Display FOV can only be equal to or less than the scan FOV

Power injectors are used for intravenous contrast instead of hand bolus and drip b/c:

Which person developed the 3D mathematical calculations for CT?

Beam hardening is mostly seen during which type of scan

A set of rays striking a detector array is called?

Alessandro Vallebona developed the tomographic image in the 1930's -40's

The x-ray tube in CT must be able to do multiple things, Which is INCORRECT?

Imaging with 2 modalities for comparison overlay for anatomy & metabolic function is done on?

Water and Volumen are both considered

Linear attenuation coefficient is also called:

When is CT IV contrast the most helpful?

______ is often used in CT to differentiate normal structures from pathology.

The greatest Student at Xavier ever is:

What is a risk associated with the use of power injectors?

All of the following are the main 3 types of contrast used for CT Except:

CT number is a:

When describing the different gen scanners, what was the major technologic difference?

A voxel is determined by the slice thickness of a scan

Raw data must go through the array processor to become a digital image.

What Gen scanners was the first to have a complete circle of detection?

______ contrast is used because it does not break down and interact with the body?

What could affect the outcome of the CT procedure?

What was the benefit to the second-generation scanners over the first?

On a CT image a CT number scale is based on what range?

______ contrast is used to distinguish loops of bowel from other normal structures and pathology.

Current detectors in CT are which type?

What engineering company helped in the development of CT scanners?

_____ and _____ are reasons not to give intravenous contrast for a necessary exam.

The measure of the thickness of a liquid, related to the frictional force as they pass each other is?

The 3 steps to processing scan data to useful images are all the following Except?

All the following are forms of contrast agents Except:

The process of applying a reconstruction filter to raw data is:

Recent development for CT is an additional cycle of calculations to clean up image, reducing noise in your image?

Technique which collects all raw data and processes together the attenuation of the data is:

A pixel is a picture element

High photon capture efficiency + high absorption efficiency + high conversion efficiency =

A group of detectors tightly abutted together is?

Which generation scanner had 1-3 detectors to collect data?

The faster scanners seen in third and fourth gen allow for:

A gantry can do all the following Except:

CT computer must be able to calculate multiple equations quickly and is the control point for Techs. Which is Correct?

Which gen CT scanner could be considered a demonstration project?

_______ is the process of creating a cross sectional plane of any body part

A smaller slice thickness has better recorded detail but requires more?

Most of the Scanners today are what Generation?

What scan time was seen in second generation scanners?

Intravenous contrast can help the Rad determine the type of tumor by how and when it enhances.

As the beam passes through patient, the # of photons in the beam is reduced while the mean energy of the photon:

What does CT acknowledge as the "Father of CT Scan"?

Ability to differentiate between small differences in density within the image?

In CT, a patient is scanned by an x-ray tube ______ the body.

CT scan has revolutionized medical imaging. Which is INCORRECT?

What was one of the disadvantages of the first CT scanner?

If the CT number is -1000 what can we determine is in the image?

An artifact that is seen as a circle in the middle of image by unseated detector:

An IV of CT contrast injections should be placed where?

The collected information of the initial scan before manipulation or recon is:

What is an easy way to reduce Viscosity?

Which is not a CT coordinate for patient positioning?

Checking impaired renal function before giving IV contrast for CT exam, what labs are we looking for?

What does BUN and Creatinine tell the Tech and MD?

DAS means what?

Power injectors are used for intravenous contrast administration instead of hand bolus and drip infusion b/c:

What new technology allowed for spiral/helical scanning?

The first CT scanners were used to scan what body part?

What does EB of EBCT mean?

Some key points for patient screening are all except

Some facilities require a consent form to be signed before IV contrast is given

Measure the ability to discriminate objects of varying density a small distance apart against a uniform background?

CT has the ability to reconstruct the axial images to produce sag and coronal. This is known as:

More pixels =

QC catagories for CT include the following except?

Fourth gen scanner had what kind of beam?

Another word for Algorithm is:

MDCT means what?

_______ Is the specific amount of table travel between scans.

The CT table is very important part of the scanning system. Which is INCORRECT?

What is scan time?

A pencil thin beam of radiation striking a single detector is called?

What is a disadvantage of conventional x-ray that is eliminated in CT?

Cone beam CT scanners are used in Oncology studies. Which is INCORRECT?

A PET scan is fusion of which two modalities?

The Third Generation scanners were:

Hounsfield knew that he was on the right track when he was able to see what on his first scan?

A matrix is a ______ of ______ and _______

Which is considered a type of negative contrast agent?