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RADT 465 EO/QC
ARRT registry review
| Question | Answer |
|---|---|
| How are diagnostic x-ray are produced? | They are produced within the x-ray tube when high-speed electrons are rapidly decelerated upon encountering the tungsten atoms of the anode. (pg431) |
| Where is source of electrons? | is the heated cathode filament; they are driven across to the anode focal spot when thousands of volts kV are applied. (pg. 431) |
| What two radiation is use in diagnostic x-ray production? | bremsstrahlung radiation and characteristic radiation (pg431) |
| Explain bremsstrahlung radiation? | when high speed electron passing near a positively charged nucleus and deflected from its course with loss of energy. The energy loss is given up in the form of an x ray photon.(pg 431) |
| What percent of x-rays come from bremsstrahlung radiation? | 70% to 90% (pg431) |
| Explain Characteristic radiation? | high speed electron encounters a atom with in an anode and ejects a K shell electron leaving a vacancy in that shell. An electron form the next shell moves to the K shell and fills its vacancy. Which emits a k characteristic ray (pg431) |
| What does wavelength refers to? | the distance between two consecutive wave crests. (pg 431) |
| What does Frequency refers to? | the number of cycles per second pg. 431 |
| Frequency and photon energy are _______ related where as wavelength and ________related as to electromagnetic spectrum. | directly ......related. pg. 432 |
| What are shorter wavelength associated with? | Higher frequency, High energy, increased ionizing potential pg. 433 |
| X-ray photons can? | Pass through the part, be absorbed by the part, Scatter within the part pg. 434 |
| List a few properties of x-ray photons. | not perceptible by the senses, travel in straight lines, |
| What x-ray can interact with tissues cells and cause ionization? | photoelectric effect, Compton scatter, and coherent (classical) scatter pg. 436 |
| Types of x-ray equipment? | fixed, mobile, dedicated, digital pg. 437 |
| What is Electromagnetic induction? | An electric current will be induced in a conductor whenever there is relative motion between a conductor and magnetic field; that is , if a conductor moves through a magnetic field, if a magnetic fields moves across a conductor, or if the magnetic is AC |
| What are auto transformer? | Select the amount of voltage sent to the transformer. (kV selector), Operate on the principle of self-induction, require AC for operation pg. 441 |
| What is step up transformer? | increase voltage and decrease amperage proportionally pg. 441 |
| What is rectifiers? | are solid-state diodes made of semi conductive materials such as silicon, selenium, or germanium that permit the flow of electricity in only one direction. pg. 443 |
| What does x-ray circuit divided what three portion? | low- voltage or primary circuit, filament circuit, high-voltage secondary circuit pg. 451 |
| What is spatial resolution in digital imaging? | in digital imaging improves with smaller pixel size, smaller pixel pitch size , smaller pixel pitch. and larger image matrix. pg. 463 |
| What is contrast resolution in digital imaging? | describe the range of greys a particular digital system is capable of resolving/demonstration. the higher the contrast resolution to see similar adjacent gray shags. |
| What is noise? | is an electronic term for anything that interferes with visualization of the image we wish to see. pg. 446 |
| Name some elements of a QC program. | Timer accuracy testing, mA linearity testing, kV accuracy testing , HVL test, focal spot sizing, evaluation of lead aprons and gloves. |
| reference | Saia, D.A. Radiography program review and exam prep/ D.A. Saia 7thed.p.;am |
Created by:
kdfields
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