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CT Review 2
Instrumentation/Components
| Question | Answer |
|---|---|
| What does the gantry contain? | Scan controller, generator, transformer, slip ring, tube, detectors, and DAS |
| What is the host computer? | the link between the tech and imaging system, which can multi-task |
| Is the Scan controller Digital to Analog or Analog to Digital? | Digital to Analog (DAC) |
| Does the generator change AC to DC or DC to AC? | AC to DC |
| What kind of assembly is the tube mounted on? | rotating assembly |
| When is the only time during imaging is the tube stationary? | for scout film |
| What are other names for scout film? | plain film and scanogram |
| The level of photons that penetrate the body is controlled by? | Kv |
| The filament temp is controlled by? | mA |
| What are the beam shaping filters? | bowtie and wedge |
| When referring to the beam wavelengths how is the beam described? | polychromatic |
| what is the range for the high voltage Kv? | 80-140 Kv |
| What is Bremsstrahlung often referred to as? | breaking radiation |
| What does Pre-collimation do? | chooses slice thickness and is used after photons produced before they enter pt body |
| What does Post-collimation do? | stops scatter and works with pre to better define slice thickness |
| What type of gas do the gas detectors use? | xenon |
| What the most commonly used detectors? | Solid state/scintillation detectors |
| what is the coordinate system used in CT? | XYZ |
| which coordinates are used as land marked creating the image? | X (across) and Y (up/down) |
| What type of converter does the DAS (Digital acquisition system) use? | analog to digital (ADC) |
| What is the Array Processor? | primary location for mathematical calculations |
| What is the Array processor's primary function? | to change raw data to CT image |
| What are the main components of the CT system? | Gantry, DAS, Array Processor, Operators console, Host computer |
| What does DICOM stand for? | Digital Imaging and Communications in Medicine |
| What does HIPAA stand for? | Health Insurance Portability and Accountability Act |
| What are some ways to store ct images? | CD, DUE, and PACS |
| What does PACS stand for? | picture archiving and communication system |
| Why is a filter at the tube window used? | to limit radiation exposure |
| What are the 2 types of collimators? | pre and post |
| What gen ct scanner uses scintillation crystals? | 4th gen |
Created by:
Chrslarsen
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