Term
| Many x-ray tables can tilt toward the head or foot of the table. Give the degree of tilt in both directions |
|
Definition
| 90 degrees to the feet; 15 degrees to the head |
|
|
Term
| Describe a dead-man switch |
|
Definition
| Disengages when the button is no longer pressed |
|
|
Term
| Compare single phase power to three phase power |
|
Definition
Single phase - permits potential difference to drop to zero after every pulse
Three phase - potential difference is boosted back toward peak before it can drop to zero |
|
|
Term
| How many cycles per second? Single Phase Power |
|
Definition
|
|
Term
| How many impulses per second? Single Phase Power |
|
Definition
|
|
Term
| How many cycles per second? Three Phase Power |
|
Definition
|
|
Term
| How many impulses per second? Three Phase Power |
|
Definition
|
|
Term
| The x-ray circuit is divided into two circuits, name them: |
|
Definition
| Main circuit, filament circuit |
|
|
Term
| The main circuit has two divisions, name them: Also indicate if the division is low voltage or high voltage. |
|
Definition
Primary - low voltage
Secondary - high voltage |
|
|
Term
| Name three types of diagnostic radiographic tube-support systems. |
|
Definition
- Overhead
- Floor to ceiling
- Floor
- Mobile
- C-arm |
|
|
Term
| What device in the x-ray circuit controls kVp? mA? time? rectification? |
|
Definition
kVp: the autotransofrmer.
mA: the variable resistor.
Time: the timer circuit.
Rectification: diode |
|
|
Term
| What is the difference between an ionization chamber and a phototimer? |
|
Definition
| Phototimers are located between the cassette and the fluorescent screen and Ionization chambers are located between the tabletop and the image receptor. |
|
|
Term
| What factor determines the minimum reaction time? |
|
Definition
| The length of time necessary for the AEC to respond to the radiation and for the generator to terminate the exposure. |
|
|
Term
| Automatic exposure control (AECs) or Automatic exposure device (AED) |
|
Definition
Programmed to terminate the radiographic exposure time.
THEY DO NOT CONTROL ANY FACTOR EXCEPT TIME. |
|
|
Term
|
Definition
One of the classifications that medical x-ray units fall into.
Diagnostic = concerned with the diagnosis of illness or other problems. |
|
|
Term
|
Definition
| A connection that permits current to flow through the circuit. |
|
|
Term
|
Definition
| The filament circuit supplies the filament of the x-ray tube with properly modified power. Its purpose is to create the appropriate thermionically emitted electron cloud at the filament. |
|
|
Term
|
Definition
| Fixed tables do not permit tilting the patient's head or feet down. They are designed for diagnostic radiographic work only. |
|
|
Term
|
Definition
| System that uses a tube-support column mounted to the floor. |
|
|
Term
| Floor-to-ceiling suspension system |
|
Definition
| System that uses a pair of rails, one on the ceiling and one on the floor, for longitudinal positioning. |
|
|
Term
| Incoming-line current (sometimes called the mains) |
|
Definition
| Power that is supplied in the form of a three-phase power cycle. |
|
|
Term
|
Definition
| The main circuit supplies the x-ray tube with properly modified power. It's purpose is to produce x-rays. |
|
|
Term
|
Definition
| Enclosed in an electrical power box. |
|
|
Term
|
Definition
| Used in falling-load generators as well as some capacitor discharge units. They monitor the product of mA and time on the secondary side of the high-voltage step-up transformer. When the desired mAs level is reached, these timers interrupt the circuit to stop the exposure. |
|
|
Term
| Minimum reaction (or response) time |
|
Definition
| A time that all AECs have, which is determined by the length of time necessary for the AEC to respond to the radiation and for the generator to terminate the exposure. |
|
|
Term
| Overhead suspension system (a.k.a. ceiling suspension) |
|
Definition
| Allows controls of longitudinal and transverse positioning as well as vertical distance. |
|
|
Term
|
Definition
| An antiquated term to refer to AEC exposure controls. |
|
|
Term
|
Definition
One of the classifications that x-ray units fall into.
Therapeutic = of or relating to the healing of disease |
|
|
Term
|
Definition
| Intended to end the exposure at an accurately measured, preset time. |
|
|
Term
|
Definition
| When full-wave rectification is applied, the net voltage produces a voltage ripple. |
|
|
Term
|
Definition
| The Radiographic tabletop must be easily cleaned, hard to scratch, & without crevices so Radiographic contrast media can't accumulate. |
|
|
Term
| Tube support, sometimes referred to as a ceiling suspension, that allows controls of longitudinal & transverse positioning, as well as vertical distance |
|
Definition
| Overhead suspension system |
|
|
Term
| Tube support system that uses a pair of rails, one on the ceiling & one on the floor, for longitudinal positioning |
|
Definition
| Floor-to-ceiling suspension system |
|
|
Term
| Tube support system that uses a tube-support column mounted on the floor |
|
Definition
|
|
Term
| vary tremendously but most are based on the floor suspension system. |
|
Definition
|
|
Term
| utilizes a C-shaped arm to support the tube & image receptor. |
|
Definition
| C-arm tube suspension system |
|
|
Term
| Supplies the X-ray tube with power |
|
Definition
|
|
Term
| Permits current to flow through the x-ray circuit & is located in the primary (low voltage) circuit between the autotransformer & the timer circuit |
|
Definition
|
|
Term
| Controls the length of the x-ray exposure & is located in the primary (low voltage) circuit between the exposure switch & the step-up transformer |
|
Definition
|
|
Term
|
Definition
|
|
Term
| Transformer that automatically sets by adjustments & is located in the primary (low voltage) circuit |
|
Definition
|
|
Term
| also called a Rheostat, controls mA selection & is located in the filament circuit between the incoming line & step-down transformer. |
|
Definition
|
|
Term
|
Definition
Rectifier (silicon-based semiconductor)
*n-type = move freely
P-type = don't move freely |
|
|
Term
| A rectifying semiconductor |
|
Definition
|
|
Term
| Decreases voltage from the primary side to the secondary side |
|
Definition
|
|
Term
| Increases voltage from the primary side to the secondary side |
|
Definition
|
|
Term
| Device programmed to terminate the Radiographic exposure |
|
Definition
| Automatic Exposure Control (AEC) |
|
|
Term
| Often used to used to refer to all automatic exposure controls |
|
Definition
|
|
Term
| Used to terminate the exposure after a desired exposure has been reached. Is positioned immediately above the image receptor. |
|
Definition
|
|
Term
| Length of time necessary for the AEC to respond to ionization |
|
Definition
|
|
Term
| Used to prevent overexposure when using AEC |
|
Definition
|
|
Term
| What is the biggest advantage of using AEC? |
|
Definition
| Provides consistency of Radiographic quality |
|
|
Term
| Backup time should be set at ___% of the anticipated manual technique. |
|
Definition
|
|
Term
| What is the maximum exposure per U.S. Public Law? |
|
Definition
|
|
Term
| Type of generator that has 100% voltage ripple |
|
Definition
|
|
Term
| Voltage never drops below zero in this type of generator |
|
Definition
|
|
Term
| What our homes operate off of |
|
Definition
|
|
Term
| Electricity in the U.S. is usually supplied to buildings by ____ alternating current. |
|
Definition
|
|
Term
| Power that is supplied to power companies & x-ray equipment operates off of |
|
Definition
|
|
Term
| Net voltage produced during full-wave rectification |
|
Definition
|
|
Term
| What is the voltage ripple for Full-wave Rectification? |
|
Definition
|
|
Term
| What is the voltage ripple for 3-phase/6-pulse? |
|
Definition
|
|
Term
| What is the voltage ripple for 3-phase/12-pulse? |
|
Definition
|
|
Term
| What is the voltage ripple for high frequency? |
|
Definition
|
|
Term
| This type of generator maximizes use of tube limits, shortens exposure times, & takes away the radiographers ability to set exposure factors |
|
Definition
|
|
