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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 |
Created by:
Chrslarsen
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