Core Mock Exam Flashcards
Medical Term for dizziness
Vertigo
When using indirect conversion DR System ,the light in the flat-panel detector is converted to an electrical signal by the
Photodiode
Noise on a digital image is the summation of inherent electron system noise and quantum noise .Of these two,the radiographer can improve the noise on an image by
Increasing the exposure technique
Which of the following transformers reduces the voltage on the secondary side to provide an appropriate current to heat the filament
Step-Down Transformers
The unit of Potential Difference is the
Volt
The unit of Resistance is
Ohm
The unit of Current is
Ampere
As a general rule,a grid should be employed when the part thickness is greater than
10 cm
Which of the following are types of technique charts
Variable kVp and Fixed kVp
Which of the following imaging modalities does not use ionizing radiation to produce the image
Sonography
A series of warm up exposures is made on a cold x-ray tube to:
Prevent damage to the anode form sudden heating
Which of the following changes decreases the dose to the limited operator:
1.Minimize the time spent in the radiation area 2.Increase distance between operator and source to radiation 3.Use shielding (control booth and lead apparel)
If an exposure time is measured as 35 milliseconds ,what is the exposure time in seconds:
0.035 seconds
The artifact that will occur when the grid lines are not aligned with the CR readers laser light is:
Moire Pattern
Free electrons at the cathode that are used for x-ray production come from the:
Filament
A “Cassettee-based” digital imaging system is termed:
Computed Radiography (CR)
The ability to distinguish anatomical structures of similar subject contrast is termed :
Contrast Resolution
In radiology ,80,0000 volts is converted to:
80 KVp
If there is a fire in your immediate area,the first thing you should do is:
Evacuate the area
Of the choices below,the greatest ALARA violation would be:
Repeating an image with an S number of 210 because of exposure technique
Test tools for focal spot size estimation include each of the following except-
Motorized Synchronous Top
A gonad shield should be used whenever the edge of the radiation field is within of the gonads:
5 cm
The most widely used and most accurate personnel monitor is the-
Optically Stimulated Luminescence (OSL)
A 28 year old radiation worker can have an annual cumulative effective dose of-
280 mSv
Which control on the viewing station can blacken out the clear or white areas around the collimation edges of a radiograph-
Shuttering
The device that is placed between the patient and the IR to absorb scatter radiation is called a-
Grid
The purpose of the photostimulable phosphor plate is to-
Store the image of the body part until processed
The current across the X-Ray tube is measured in units of-
Milliamperes
Which of these statements is true -
If the KVp increases ,the scatter radiation fog increases
The penetrating power of an X-ray beam is determined-
By its energy as expresses in its wavelength
The process of reducing the probability of infection or organisms being transmitted to a susceptible individual is called-
Asepsis
Which of the following are the types of radiation produced in the anode-
Characteristics and Bremsstralung
What is Erythema-
Reddening of the skin caused by high dose of radiation
What is the normal range of temperature when measured orally-
96.8 to 99.6 degrees
How is the wavelength of a sine wave measured-
The distance from one crest to the next crest
The anode heel effect is a phenomenon of X-Ray production that results in-
Uneven distribution of radiation within the field
Which control on the viewing station controls the density or brightness in the radio graphic images-
Window level
The auto transformer is primarily used for -
Variable kVp selection
The accuracy of three-phase generator time settings can be measured with a -
Motorized synchronous spinning top test
The radiation weighing factor for X-Ray photons is,which of the following-
1
The number of gray shades that a digital system can reproduce is termed-
Dynamic Range
What is Sepsis-
A serious condition resulting from the presence of harmful microorganisms in the blood or other tissues and the body response to their presence ,potentially leading to the malfunctioning of various organs,shock or death
Appears because of insufficient exposure to IP and by low mA or low kVp,images will have a grainy,or sandlike appearance
Quantum mottle
Occurs when the grid lines are not aligned with the laser scanning frequency of CR reader
Moire Pattern
May appear as a result of incomplete IP erasure and can lead to incorrect diagnosis-
Phantom or ghost images
Is used to blacken out the white collimation borders
Electronic cropping also known as masking or shuttering
Is a plot between frequencies of occurrence versus the digital value of each pixel
A graph of the minimum and maximum signals in the image
Histogram
Creates a radiograph image by converting x-rays energy into a digital image electronic signal-
Digital Radiography (DR)
