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RT 296 IT for RT
Test 3 study
Question | Answer |
---|---|
What are the 2 ways to acquire digital images? | Direct and Indirect |
Direct capture | devices convert the incident xray energy directly into an electrical signal then sends to computer |
Indirect capture | absorb xrays, converts them into light and light then converted to electrical signal that is sent to the computer for processing and viewing |
What does indirect capture use to convert xray to light,then to electric signal? | charge-coupled device (CCD) |
What is AMA? | active matrix array |
what does scintillation mean? | emit light |
What is a reason digital radiography has less repeats? | because of latitude |
Latitude | range of exposure factors that will produce an acceptable image |
Matrix | rectangular or square table of numbers that represent the pixel intensity to be displayed on the monitor |
Pixel | basic picture element on a display |
Bit depth | the number of bits stored per pixel, defines the shades of gray available for each pixel |
Greater the bit depth, greater the what? | contrast resolution |
How many bits in a byte? | 8 |
What kind of image is needed for human viewing? | Analog |
What is the measure of luminance of a monitor calibrated in units of candilla per sq meter? | Brightness |
Noise | any type of signal interference in a digital image |
Exposure index | the amount of exposure received by the image receptor, not the patient |
contrast resolution | ability of digital imaging systems to display changes in gray scale values |
Contrast | differences in brightness between light and dark areas of an image |
Resolution | recorded sharpness of structures on image |
Distortion | misrepresentation of object size or shape |
Histogram | bar like graph, graphic representation of all the digitally recorded signals of a digital xray exposure |
What do direct capture flat panel detectors use to covert xray photons to electrical signals? | thin-film transistor (TFT) |
A generic term that is used to describe a programmable electronic device that can store, retrieve, and process data is a? | computer |
Spatial resolution in digital imaging is dependent on what? | pixel size |
Which is desirable to SNR, a high or low ratio? | high SNR |
RAM | random access memory |
The system where billing info is? | HIS |
Workflow | amount of work or exams completed over a period of time |
IR | image receptor, a device that changes the xray beam into visible image |
EMR | electronic medical record |
EHR | electronic health record |