CLUSTER 2

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問題一覧

What functional unit of measurement for image sharpness?

Lp/mm

Which of the following is most likely Kilovoltage technique chart?

variable kvp technique chart/improper safelight filter

Which of c of an automatic processor?

development system

What is the active ingredient of the radiographic film emulsion?

silver halide crystal

The action of the developer is controlled by which of the following

time temperature activity

At what stage in automatic processing is the latent image made visible?

developing

What temperature that a processed radiograph be stored?

70°F and 60% humidity

Which of the following types of artifacts is most distinctive and identifiable?

pi lines

When cleaning a processor, which tank should always be filled first?

fixer

What is the optimal reducing agent temperature for an immersion time for 4-8mins?

20°C

What are the Primary agents of the developer?

reducing

Film transfer system is also known as:

passbox

What artifacts which occur because of rapid movement of the film in the darkroom?

tree-like static

Which types of test can use a Wisconsin test cassette?

kVp measurement

What is chemical having a high hydrogen potential (H+)?

acids

The film base commonly used during the years 1900 until 1924 was:

cellulose nitrate

The invisible image that is produced in the film emulsion by exposure to light or x-rays is called the:

latent image

When a portion of the radiographic image appears blurred, it is due to:

poor screen film contrast

What factor being controlled by the level of activity of the hydroquinone?

contrast

Which of the following is considered a special starter solution must be added to the replenisher when starting a fresh tank of developer?

acetic acid potassium bromide

Artifacts caused by wet pressure sensitization usually occur:

in developing tank

What is the safety precaution against leaks and overflow?

drains/drainage

What agent that controls the subtle gray tones early in the development process?

phenidone

What solution that provides acidic pH and stops reduction?

activator

What is the most common cause of contamination of the solutions?

splashing

What subsystems is used to bend and turn the him when it reaches the top of the transport Rack must be directed down into the next section?

crossover network

Why does the manufacturer pack x-ray film in metal foil?

to protect from light to moisture

What is the primary purpose of the circulation system?

agitate the film

According to quality assurance programs, how often should the chemicals be changed in a processor?

once a month

What solution that is dramatically affected by contamination?

developer

What chemical is effective only in alkaline solution?

glutaraldehyde

Radiographs begin coming out too dark from one particular processor in the department. This could be a result of which f the following?

increased developer temperature increased developer time

If the developer replenishment is set too low, which of the will result?

films will show low contrast

Which of the following equipment’s is required to produce a uniform range of densities of a Film:

sensitometer and penitrometer

What formulae is necessary to compute the actual volume of the tanks capacity by liters?

Width x length x depth-2.5cm divided by 1000

What system wherein one chemical solution is physically heated and that solution is

developer solution

What techniques that makes it difficult to maintain quality control and to complete the Processing tasks is a reasonable period of time?

hand processing

Which of the following are methods of silver recovery commonly used in diagnostic imaging Department?

electrolytic metallic replacement

The basic constituent in a developer are:

accelerator preservative and developing agent

What parts of automatic processor components are ribbed to prevent wet film from sticking To a flat surface and jamming up in the processor?

squeegee

Temperature variation in older models of automatic processors are often related to changes in the

in coming water supply

What is a strong acid that can burn the eyes and irritate the skin?

fixer

Film speed is affected by which of the following:

immersion time solution temperature chemical activity

The repeat rate is described by which of the following:

should be determined quarterly

When films in the receiving bin are damp, the least likely cause is:

blower glutaraldehyde deplition

Which of the following will cause improper agitation in an automatic film processor?

broken circulation pump

How many percent of the x-ray striking an x-ray film is absorbed by the emulsion to expose It?

less than 1%

The first step in processing is designed to

soften the emulsion

The purpose of a stop bath is to

remove excess developer from the emulsion

All but which of the following must be optimized to ensure best image quality?

time of fixation

The time of developer immersion is critical. It should be within ______of the Manufacturer’s recommendation.

+2%

Replenishment of which tank in the processing system is not important?

washing

When a large film is inserted into an automatic processor,

short dimension should be against the rail

adequate drying is necessary to

increase archival quality

Double-capacity processors can process a film in

180 sec. or 3 mins

The minimum flow rate for wash water is ______ gallon(s) per minute

3 or 12 liters

Between the fixing tank and the wash tank, the film passes through a

crossover rack

Which of the following is not one of the major systems of an automatic processor?

development system

The principal purpose of the circulatory system is to

agitate the chemistry/film

under-replenishment of the developer will result in a

great decrease in contrast

The segment of the circulation system most likely to contain a filter is

developer

Control of the replenishment system is accomplished by a

microswitch

Circulation of the developer at the rate of approximately will ensure adequate Agitation,

15 liters per min

The transport system includes all but the following

drying chamber

The replenishment system is critical. Therefore

Fixer replenishment should be about 100ml for each 1 in of film

Which of the following is not part of the transport system?

fluid pump

Which of the following artifacts might be associated with poor processing?

pi lines

If a radiograph turns yellow during storage, it may be the result of

incomplete washing/hyporetension

Which of the following is not a necessary part of a quality assurance program?

determination of film-base thickness

Which of the following best describes an example preventive maintenance?

changing motor oil every 3000 mi

In establishing a processor maintenance program, which of the following would not be included?

productive maintenance

With a 90-s processor, immersion time in the developer is approximately

20 sec/22 sec most accurate

Most facilities would be sure that the automatic processor was

cleaned weekly

The classification of artifacts includes all except

location artifacts

The distinct patterns of static artifacts do not include

finger static

Processor cleaning

takes no more than few minutes

Scheduled maintenance does not include

part replacement

Failure of a system or subsystem of an automatic processor will result in

non schedule maintenance

Pi lines are so-called because

The occur at intervals of π times the roller diameter

Which of the following types of artifact is most distinctive and identifiable?

pi lines

Guide shoe artifacts will be found on the _______ of a radiograph

leading and trailing edges

Intensifying-screen speed increases with increasing

phosphor thickness

A non-screen technique is used in radiography primarily because it

results in less blur

The resolution achievable with intensifying screens is approximately?

10 1p/mm

Which of the following factors controlled by the technologists affects screen speed most?

kVp

When screen film is the image receptor, image quality is a trade-off among speed. Resolution, and radiographic noise. In general

as speed increases so does noise

The intensification factor

Is higher for rare earth screens than for calcium tungstate screens

Screen unsharpness

Is the loss of sharpness of the image when screens are used

Concerning luminescence, which of the following statements is true?

There are two kinds: fluorescence and phosphorescence

Intensifying screens are used with radiographic film to

reduce exposure to the patient

Intensifying screens are used in conjunction with radiographic film to

lower the mAs is necessary to produce a proper radiograph

Once x-ray interaction with a phosphor produces light isotropically

the light spread out

Which of the following is not a required characteristics of a base for an intensifying screen?

translucent

Quantum detection efficiency (QDE) refers to

ability to absorb x-ray

Phosphor afterglow

is also called lag

The patient exposure for a direct-exposure chest x-ray examination is 210 mR (54 uC/KG) If par speed screens are used, the exposure required is 15mR (3.9 uC/kg). The intensification factor is

A direct exposure radiograph requires 650mR (169 uC/kg). If the intensification factor of rare earth screens is 200, what would the patient exposure be?

3.25 mR

Mammography conducted with detail screens results in exposures as low as 30 mR(77 UC/kg) The intensification factor for these screens is about 30. If such an examination were conducted as a non-screen procedure, what would the patient exposure be?

9000 mR

Which of the following is not a rare earth element?

yttrium

100

In The formula La,O,S To the Tb

improves luminescence

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GAJE, Harvey Jay M. · 75問 · 2年前

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GAJE, Harvey Jay M. · 79問 · 2年前

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