CorecTec exercise 9 (Image production-Equipment operation and quality assurance

Tapping windings of the auto transformers to supply voltage to the step up transformer is the purpose of what?

kVp selector

What is not a part of a direct capture flat panel director?

Fluorescent layer

Where in the X-ray circuit is the timer located?

Between the autotransformer and the step up transformer

________ releases electrons when struck by light photons and __________ releases electrons when struck by X-rays.

Amorphous silicon, amorphous selenium

The latent image in a flat panel detector is formed by what?

Charged capacitors

What controls the incoming voltage to the autotransformer?

Main breaker switch

A coil of wire rotating through a magnetic field produces an electric current...this describes:

Generator

When will a space charge be present in the X-ray tube?

Whenever the rotor is engaged

What is the voltage supplied to the autotransformer called?

Line voltage

What does the CR reader use to release the energy stored in the imaging plate?

Red laser light

Which system captures the X-ray image, converts it to light, and then converts that light to an electric signal?

Indirect digital imaging

What is the name of the filtration that is a permanent part of the X-ray tube head?

Inherent filtration

What parts make up the cathode end of the X-ray tube?

Filaments and focusing cup

Why is the X-ray tube made from lead impregnated glass and encased in a lead housing?

Prevents leakage radiation

In a rotating X-ray tube, what coats the tungsten disk?

Tungsten rhenium alloy

What layer of a CR imaging plate is sandwiched between the phosphor layer and the conductive layer?

Reflective layer

What determines the strength of a magnetic field?

The number of magnetic field lines in an area

What is a current-carrying coil of wire called?

Solenoid

What is it called when a current is induced in a secondary coil by simply alternating the current in the primary coil?

Mutual induction

Which layer of a CR plate keeps the phosphor layer intact during handling?

Protective layer

What is the area of the X-ray target called that is struck by electrons?

Actual focal spot

What meter doesn't register until an X-ray exposure is made?

Milliammeter

The photostimulable phosphor that is used in a CR's imaging plate is a barium fluorohalide compound that is doped with:

Europium

What device measures electrical current?

Ammeter

What causes electrons to move in a conductor?

Voltage

What is the formula for electrical power?

P=VI

What device would be used when the milliamperage is set on the control panel?

Rheostat

The changing of alternating current to direct current is known as:

Rectification

What is the purpose of a compensating filter?

Produce uniform exposure in an image

What type of current supplies the X-ray tube?

Direct current

A technique of 70 kVp at 400 mA produces how many watts of power?

P=VI P=70,000volts x .4 amps = 28,000 watts

Which of the following is smallest?

A. Space charge

B. Actual focal spot

C. Effective focal spot

D. Target

Effective focal spot

What units are filament currents measured in?

Amperage

In a CR system, an ADC converter converts an electric signal into:

Numbers

What effect does adjusting the filament control have on the production of X-rays?

Controls the quantity

Which type of rectification will supply the X-ray tube with the greatest power?

Full wave

What is placed in a circuit in case the current surges during the exposure?

Breaker switch

During thermionic emission a cloud of electrons surrounds the filament. What is this cloud called?

Space charge

What are X-ray tubes called that have 2 filament wires?

Dual focus tubes

What is the unit of electrical charge?

Coulomb

What happens when a wire moves through a magnetic field?

An electromotive force is induced in the wire

Arrange in order, from top to bottom, the layers of an indirect flat panel detector.

1. Fluorescent layer

2. Photodiode layer

3. TFT layer

The filament wires in radiographic tubes are made from what metal?

Tungsten

What is the unit of electrical power?

Watts

What electrical device will prevent equipment damage if currents get too high?

Circuit breaker

What is the most accurate timer?

electronic timer

If the voltage is stepped-up, what happens to the current in the secondary side of the transformer?

decreases

What works by sending an AC through a wire that has been placed within a magnetic field?

motor

Image extraction in flat panel detectors is done in what order?

1. Data is read from columns and rows line by line

2. Data is digitized by an ADC

3. A histogram is created and analyzed by software

What device stores electrical charges?

Capacitor

Which transformer core is most efficient?

Shell

What current is indicated by the milliameter?

Tube current

What is the unit of electrical current?

ampere

What are the swirling currents called that are induced in transformers and produce heat losses?

eddy currents

The target of an X-ray tube is made from what metal?

Tungsten

An electrical charge can be neutralized if it is conducted to what?

Ground

How can voltage be induced into a conductor?

1. Move a wire through a magnetic field

2. Move a magnetic field across a wire

3. Place a wire in a varying magnetic field

What is the major reason for using alternating current?

Transformers cannot operate without it

What is the purpose of a window in an X-ray tube?

for the emission of x-rays

What determines the quantity of electrons that will be accelerated across the X-ray tube?

Heating of the filament