+
Related Flashcards
Related Topics
Cards In This Set
| Front | Back |
|
What capture the x rays Beams once it exit the patient?
|
IMAGE RECEPTOR
|
|
To produce an X ray what is needed?
|
1) source of electrons -filament/cathode
2)source of high voltage (kvp) cause electron stream to accelerate at high speed from cahtode to anode 3) target/anode/rotor: something to slow or stop the stream of electron |
|
What are X RAYS?
|
X RAYS ARE;
* photons/particles of energy - highly penetrating, invisible,speed of light(186.000 miles/sec. travel in straight lines/diverge from point of origin have different ENERGIES |
|
MAJOR TYPE OF IMAGE RECEPTOR
|
1) FIlm /screen (cassettes)
2) Digital 3) FLUOROSCOPIC (real life-time imaging0 |
|
What is the PRIMARY BEAM/PRIMARY RADIATION)?
|
1) the X ray beam that exits the X ray tube, consists of
a Multitude of x ray photons 2) only exist between the Tube and Patient 3) made up of x ray photons of many different Energie |
|
WHAT IS THE REMNANT BEAM (RADIATION)
|
* what remains of the primary beam after it passes
through the patient. * it's what produces the image on the various image receptor |
|
WHAT IS SCATTER RADIATION?
|
*X ray photons once passing through the patient,
divert from their normal path. *once diverted doesn't carry any useful diagnostic info *if it reaches the image receptor, will cause Fogging effect |
|
WHAT IS ATTENUATION?
|
*Process by which the primary beam is reduced in energy
*primary means is absorption *amount of attenuation varies with different tissue bone=absorb x rays appear WHITE /soft tissue (black) *difference in attenuation=) formation of image differential of absorption |
|
What type of tissue reduce1) remnant radiation
reduce2) radiographic density on image LIGHTER IMAGE? |
TISSUE WITH HIGH PHYSICAL DENSITY
attenuate the beam more Bones appear white or light. |
|
What type of tissue increase the remnant radiation/increase the radiographic density on image
darker image |
Tissue with low physical density attenuate
the beam less. ex: lung appears darker |
|
What is RADIOLUCENT?
|
Any material that allow the RELATIVELY aesy passage of X RAYS .ex: AIR/TABLETOP/SPONGES
material with low |
|
WHAT IS RADIOPAQUE?
|
MATERIAL THAT don't allow the relatively easy passage of X RAYS
BONES/LEAD material with high physical density= radiopaque |
|
What are the EXPOSURE FACTORS?
OR TECHNIQUES under the direct control of Radiographer to produce QUALITY RADIOGRAPHES |
* VOLTAGE: (KVP) P= PEAK
*CURRENT( mA) *time(SEC) |
|
WHAT IS KILO-VOLTAGE ( KVP)?
|
*Electrical potential(pressure/force) that propels the current (mA) FROM CATHODE TO Anode.
*directly controls energy penetrating ability of primary beam. *indirectly controls the quantity of x rays produced (15%rule) |
|
What is MILLI-AMPERAGE (mA)?
|
*quantity of electrical CURRENT passing through the X ray tube from cathode to anode.
mA- directly controls the QUANTITY of X rays produced |
