RAD 121 FINAL EXAM SP2024

adding, removing, or changing a grid requires an adjustment in _______ to maintain radiation exposure to the IR.

the actual flow of electrons from the cathode to the anode within the xray tube is known as

to change the radiation to the IR by a factor of 2, how muchchange in kVp is needed?

If the detector is exposed directly by the primary beam, the IR exposure will be?

the focusing cup is made of

the height of lead strips relative to the distance between the lead strips is the measure of

the max speed of the rotating anode will typically achieve is _________rpm

what is the appropriate setting for the backup time/mAs

when using AEC, what is a commoncause for repeating images

Brightness gain is determined by multiplying the flux gain and magnification gain

grid cutoff happens if the center of the x-ray beam is not aligned from side to side.

What are the cardinal principles of radiation dose?

when a computer is first turned on, what is the program that is used?

As grid ratio increases, exposure to the IR decreases

X-rays were discovered, it caused a barium platinocyanide coates plate to .....

when the EI value indicates too little radiation reaching the IR and the image noise is ↑ what changes need to be made

As beam restriction increases

AEC elimanates the need for the technologist to select what?

the distance between the object being imaged and the IR is the?

what is the boiling of of electrons from the filament when current is applied?

the first generation of computers was run with _______

The heat produced when the x-ray exposure is activated is transferred to the _______ that surrounds the x-ray tube.

Once a predetermined amount of radiation is transmitted through the patient to the AEC detector, what happens?

the xray beam that leaves the patient in the direction f the image receptor is often referred to as

what is erythema?

Using a higher kVp with AEC ____ the exposure time and the overall ____ needed to produce a diagnostic image.

Electrons hit the ____ after exiting the anode

when the diagnostic primary xray beam interacts with anatomic tissues, what three processes occur?

what is the loss of some of the energy from the xray beam as it passes through the tissue being imaged

As mAs increases, the quantity of radiation reaching the IR

As the focal spot increases, ______ increases and spatial resolution_________

As beam restriction increases, field size and patient dose

the ___ is the portion of the xray tube that contains the filament

when using AEC, if patient thickness decreases, what happens to the exposure time.

occurs when a projectile electron avoids the orbital electrons of a tungsten atom & travels very close to the nucleus

the input phosphor is ___ tha the output phosphor

as _________ increases, the quantity of radiation reaching the IR increases.

What is Barium platinocyanide?

the volume of tissue irradiated is affected by both the __________ and the ______

As ____ increases, the xray beam intensity becomes spread over a larger area

Instilling a negative contrast agent in the GI tract decreases brightness in the area of interest

the cathode filament is made of?

what type of images display fewer shades of gray but better differences among them.

what is an electrical motor that turns the rotor at very high speed?

what term is used to evalute the accuracy of the anatomic structural lines displayed.

releasing the pressure applied to the ________ will terminate the radiation exposure during fluoroscopy

the distance between two successive crests of the sine wave is known as

The AEC works by measuring the radiation that exits the patient

high kVp resuts in what?

during selection of the focal spot size, the tech is really selecting what?

frequency is measured in....

the part of the image intensifier absorbs light and converts light to electrons

the distance between the radiation source and the image receptor is the

when operating a stationary fluoroscopy unit, the SSD should not be less than

produced when a projectile electron interacts with an electron from the inner shell of a tungsten atom?

Image formation where the xray beam interacts with the anatomic tissue, and a portion of the beam passes through tissue.

what is the positively charged electrode composed of molybdeum, copper, tungsten and graphite?

the unit used to measure occupational dose, aka dose equivalent?

the device that recieves the radiation leaving the patient is the

the unrestricted primary beam produced a _______ area of exposure

When using fluoroscopy, what type of imaging is accomplished?

A primary goal to an exposure technique chart is to produce produce quality images consistantly

minimum response time refers to the longest exposure time that the system can produced.

shape distortion can be created by?

An expression of the relative risk to humans of exposure to ionizing radiation. (population)

the misrepresentation of the size of an object is...

the wavelength and frequency of x-rays are __________ related?

A larger xray beam field size results in....

The air gap technique is based on the simple concept that much of the scatter will miss the IR with increase OID

As collimation increases, exposure to the IR increases?

modern day computers use ______ to store information.

the positive side of the x-ray tube is

during attentuation of the x-ray beam, the incoming x-ray photon may lose energy and change direction as a result of

decreasing collimation results in

during attentuation of the xray beam, the _______ is responsible for the total absorption of the incoming x-ray photon.