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CT CHAP 2
Data Acquisition
Question | Answer |
---|---|
What is the opening of the gantry called? | Aperture |
What is the typical size of the aperture? | 70-90 cm |
What is the usual degree of possible gantry tilt? | 15-30 degrees |
How are the components attached in the gantry? | Mounted on a rotating scan frame |
What replaced the recoiling system cables on early CT scanners? | Slip Rings |
What does a slip ring do? | Permits the gantry frame to rotate continuously making helical cans possible. |
What kind of generators are small enough to fit into the gantry? | High-frequency |
What did older CT systems used; that have now became obsolete? | 3 phase generators |
Why do we use a high kV for CT when concerning the life of the tube? | High kV reduces the heat: extending life. |
How can we intensify the beam and lower patient dose? | Using High kV |
What is the average kV used in CT? | 120-140 |
What produces high voltage and transmit to the xray tube? | Generators |
How is the power capacity listed in the generator? | Kilowatts kW |
Name some cooling systems located in the gantry. | Blowers, filters, or devices that perform oil to heat exchange. |
What is the material and atomic number for the anode? | Tungsten Atomic #74 |
Using high kV does what in the life of the xray tube? | by reducing the heat load |
What are the 5 main components to an CT system? | 1) Scanning Gantry 2) Xray Generator 3) Computer System 4) Operators Console 5) Physician Viewing Console |
What is the gantry? | The ring shaped part of the scanner that houses the components that produce & detect xrays. |