Term
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Definition
This type of x-ray equipment is for general medical x-ray use and uses kilovolts
(10-1200 mA & 25-150 kVP) |
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Term
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Definition
| X-ray equipment that uses millions of electron volts (meV) |
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Term
| X-ray tables - list 9 features: |
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Definition
- Must be radiolucent
- Comes in flat or curved tops
- Must be easily cleaned
- Must be hard to scratch
- Must not have crevices that allow contrast media to accumulate
- Must have a bucky tray to hold IR
- Fixed or tilting tabletop
- Tiltling tables must have foot-board attachments
- Compression bands
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Term
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Definition
| This type of x-ray tube support is suspended from the ceiling on a set of rails allowing movement anywhere in the room both longitudinally and transversely. |
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Term
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Definition
| This type of x-ray tube support only allows longitudinal positioning |
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Term
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Definition
This type of x-ray tube support is mounted on a single column, offers limited longitudinal variation.
(like in our lab!) |
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Term
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Definition
| This type of x-ray tube support is based on floor suspension, but column can be moved to any location. |
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Term
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Definition
This type of x-ray tube support is c-shaped aperture holding the fluoroscopic tube and image receptor.
Portable c-arms are used in surgical procedures and fixed c-arms are found in specials and cat lab suites. |
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Term
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Definition
This type of x-ray tube support is an adapted floor-to ceiling unit without a table. These are specified for cranial work.
i.e. Panorex |
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Term
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Definition
| This type of x-ray tube support contains a movable bucky and are anchored to a wall corresponding to the transverse lock of the overhead tube (mammo, chest, tomo) |
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Term
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Definition
| Supplies the x-ray tube with power with the purpose of x-ray production. |
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Term
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Definition
| Supplies the filament at the cathode with power with the purpose of thermionic emission. |
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Term
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Definition
| This ends the exposure after a pre-set time had been achieved. |
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Term
| Milliampere Second Timers |
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Definition
These monitor mAs on the secondary side of the step-up transformer.
When set mAs has been reached, the timer will interrupt current in the circuit. |
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Term
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Definition
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Term
| Where are Phototimers located? |
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Definition
| This is located under the image receptor |
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Term
| Where are ionization chambers located? |
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Definition
| This is located between the patient and image receptor. |
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Term
| What is the main reason to set up backup time? |
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Definition
This is to prevent extreme overexposure to the patient in case of operator error.
i.e failing to select proper bucky, bucky not aligned with CR, poor patient positioning or if there is a metal prosthetic device in the patient that overlies in a photocell. |
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Term
| Rule of Thumb - for backup times |
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Definition
| Should not exceed the tube limit and should be set approx. 150% of the anticipated manual exposure mAs. |
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Term
Describe the operation of an Ionization Chamber
(pg 104) |
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Definition
- X-ray beam penetrates the patient and tabletop, then strikes the ion chamber
- The ion chamber terminates the exposure when a predetermined amount of x-ray photons has reached the chamber, based on the corresponding density setting at the control panel.
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Term
| How many pulses per second does a single phase generator with full-wave rectification use? |
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Definition
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Term
| How many pulses per second does a 3 phase 12 pulse generator use per second? |
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Definition
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Term
| How many pulses per second does a 3 phase 6 pulse generator use per second? |
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Definition
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Term
| Which type of generator is most efficient? |
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Definition
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Term
| Which type of generator is least efficient? |
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Definition
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Term
| What is the voltage ripple of a single phase generator? |
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Definition
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Term
| What is the voltage ripple of a 3 phase 6 pulse generator? |
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Definition
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Term
| What is the voltage ripple of a 3 phase 12 pulse generator? |
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Definition
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Term
| What is the voltage ripple of a high efficiency generator? |
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Definition
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Term
| Nearly all x-ray equipment operates from an incoming line of ___-___ volts. |
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Definition
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Term
True or False
Most portable units are single phase generators |
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Definition
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Term
| Define rms voltage (root mean square) |
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Definition
| An approximate average of the amount of the wave that is deemed useful |
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Term
| Which generator produces a near constant potential voltage waveform? |
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Definition
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Term
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Definition
| A rectifying semiconductor made by sandwhiching p-type crystal with an n-type to forma p-n junction. |
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Term
| What are the devices that are used to provide rectification? |
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Definition
Solid-state semiconductor diode
and
vacuum-tube rectifier |
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Term
| How many diodes are need to provide full-wave rectification? |
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Definition
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Term
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Definition
| A device used to increase the voltage from the primary to the secondary coil. |
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Term
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Definition
| A device used to decrease the voltage from the primary to secondary coil. |
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Term
| Definition of autotransformer? |
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Definition
| A transformer that automatically sets by adjustments. |
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Term
| Primary purpose of the autotransformer? |
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Definition
| Serve as the kilovoltage selector |
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Term
| What part of the x-ray circuit is responsible for terminating the x-ray exposure? |
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Definition
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Term
| Definition of ionization chamber? |
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Definition
| An automatic exposure control device used to terminate the exposure after a desired exposure has been reached. |
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Term
| Which transformer allows the technologist to set the desired kilovoltage at the control panel? |
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Definition
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Term
| What type of switch must be utilized for the exposure button on the control panel? |
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Definition
| I am pretty sure she is talking about the main circuit switch..... |
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Term
| What will happen if the technologist fails to select the proper bucky during an exposure? |
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Definition
| the wall Bucky would be waiting for a # of photons to hit, so the exposure time would be extremely long, resulting in way too much dose for the patient. |
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Term
| Why is AC required for mutual induction? |
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Definition
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Term
| What side of the x-ray circuit uses amps versus milliamps? |
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Definition
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Term
| What side of the x-ray circuit uses volts versus kilovolts? |
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Definition
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