Review for Fluoroscopy final
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| If a fluoroscopic image is not bright enough for diagnostic purposes, will prolonged observation improve perception? | show 🗑
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| show | No
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| As the kVp is increased and mAs correspondingly decreases, what happens to the patient skin exposure? | show 🗑
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| show | Collimate the x-ray beam to the area of clinical interest.
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| show | The patient
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| show | No
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| show | Resolution
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| Is the dose received by an occupational worker for his/her own medical or dental diagnosis defined as an occupational dose according to the California Radiation Control Regulations? | show 🗑
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| When a multifocus image intensifier tube is operated in magnification mode, what happens to the voltage applied to the electrostatic lenses? | show 🗑
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| show | The patient's body
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| show | A Primary Barrier
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| What are two reasons why film badges are used by radiation workers? | show 🗑
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| What will moving the image intensifier away from the patient do in regards to patient dose in a fluoroscopy system equipped with ABS & the tube is fixed below the table? | show 🗑
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| show | Collimation & the Dead-man's switch.
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| show | It will double the patient dose & double the exposure to the operator.
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| Which of the following is not considered a safety feature of a fluorscope..... grid ration of 16:1, dead-man switch, bucky slot cover, cumulative timer? | show 🗑
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| If the collimating cone/diaphragm of mobile fluroscope unit is removed while the unit is in operation, which of the following will occur..... An audible signal, red light glowing on control panel, production of x-rays prevented by interlock, nothing? | show 🗑
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| show | 2.2 rads/minute should not be exceeded
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| show | The central portion of the output phosphor possesses the greatest resolution.
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| show | mA (Milliampere)
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| show | May not exceed 5 rads/minute
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| Is an automatic brightness control circuit required on a mobile fluoroscopic unit? | show 🗑
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| show | Yes
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| Is a device to prevent operation when the x-ray beam is not intercepted by the primary beam required on a fluoroscopic unit? | show 🗑
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| show | 5.0 Roentgen's
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| What unit does the film badge report express an individual's radiation dose equivalent in? | show 🗑
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| show | Indefinitely
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| show | How many light photons are produced by each electron
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| show | No. Yes. Yes. Yes.
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| A protective curtain should be interposed between the operator & the patient because scattered radiation exposure at 1 foot from the patient can be as high as how many mR/hour? | show 🗑
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| show | A dead-man's switch. Yes.
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| How many mm lead equivalent is required for protective aprons used during fluoroscopy according to California Radiation Control Regulations? | show 🗑
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| Which of the following would cause greatest skin dose to the patient..... Short SID, Long SID, Small Focal Spot, Highest practical kVp? | show 🗑
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| What is the normal viewing distance for an image? | show 🗑
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| If the x-ray tube is moved rapidly during a fluroscopic exam, the image will blur. Which of the following is this a result of.... too low kVp, too low mA, camera tube lag, quantum mottle? | show 🗑
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| What is the function of an Automatic Brightness Control Mechanism of an image intensified fluoroscope? | show 🗑
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| What does the equation (normal mode size) squared/(magnification mode size)squared represent? | show 🗑
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| What is the correct position to wear a film badge during fluoroscopy? | show 🗑
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| show | 3 rad.
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| show | Yes
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| show | Yes
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| show | Yes
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| show | 105 mm
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| show | Interlaced scanning
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| show | Shaped, contract shielding.
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| The source to skin distance for image intensification should not be less than how many inches of the following...... 5", 15", 18", 40"? | show 🗑
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| What is a typical setting for mA of the following for spot filming..... 2, 5, 10, 150? | show 🗑
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| show | Daily
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| For mobile C-arm fluoroscopic equipment, inherent provisions must ensure a minimum source source to skin distance of how many inches? | show 🗑
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| The California Radiation Control regulations require that the minimum lead equivalence of gonadal shielding must be what? | show 🗑
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| show | A decrease in light intensity at the periphery of an image.
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| show | 500 mrem
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| show | line pairs/mm
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| Which of the following characteristic describe contrast media.... Solid form, high atomic number, low atomic number, low toxicity? | show 🗑
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| Which of the following are disadvantages of using a flat piece of lead for gonadal shielding..... Cannot be used for erect views, difficult to keep in place, is not very useful for fluoroscopy? | show 🗑
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| What is the purpose of synchronization in CINE? | show 🗑
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| The recognition of integration time of the human eye is the time it takes for recognition of an image. How long is this time? | show 🗑
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| show | In the room as far from the patient as practical.
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| Which of the following factors result in a brighter image being produced at the output phosphor of an II.... The type of camera, tungsten filament (cathode), flux gain, minification gain? | show 🗑
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| Which of the follwing is the best description of a virtual image.... image created by actual intersection of light rays, image on cine film, image seen on the monitor, image that cannot be seen an exists only for computational purposes? | show 🗑
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| When switching from a 15" to 19" TV screen does the number of horizontal lines change? | show 🗑
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| show | A closed circuit TV system has all its signals carried through cables.
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| show | Dim light vision, or scotopic vision.
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| When does electronic intensification occur in the II? | show 🗑
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| A technologist will receive most of the occupational exposure from which types of the following radiation.... Primary, Scattered, Exit, Gamma? | show 🗑
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| California Radiation Control Regulations require the total filtration permanently fixed in the useful beam for fluoroscopy may not be less than what Al equivalent? | show 🗑
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| The intensity of the x-ray beam at the tabletop during fluroscopy should not exceed how many Roentgen's/minute for each mA of operating tube current at 80 kVp? | show 🗑
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| show | 5 mA
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| What is the predetermined time limit that must not be exceeded for the cumulative manual reset timer? | show 🗑
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| show | 10 rad/minute
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| show | 5 rad/minute
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| Which of the following will terminate fluroscopy after a preset period of time.... phototimer, cumulative timer, cumulative dose timer, fluorescent timer? | show 🗑
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| Genetic dose refers to what? | show 🗑
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| What is the most conservative type of dose effect curve and also the curve upon which radiation protection guides and regulatory requirements are based is what? | show 🗑
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| show | The degree of mitotic activity, number of undifferentiated cells, length of time cells of tissue are in active proliferation
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| show | Several hundred rads
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| Which of the following is a disadvantage of a thermoluminescent dosimeter (TLD)...... Recharging is necessary, range of measurement is limited, not reusable, no permanent record is provided? | show 🗑
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| X-ray photons during fluoro are primarily absorbed by which of the following... primary barrier, the patient, air, image intensifier? | show 🗑
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| Source to tabletop distance in fluoroscopy shall not be less than how many inches? | show 🗑
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| Which of the following may perform fluro if they possess a valid up to date certificate issued by the State... certified RT, limited permit technician, student of RT, licentiate of the healing arts (physician)? | show 🗑
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| When misdirected light photons reach the output phosphor, image density increases or decreases & image contrast increases or decreases? | show 🗑
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| Why does the lag or blurring occur when utilizing a vidicon camera? | show 🗑
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| What is the minimum lead equivalent that the opening for the bucky tray must be covered by? | show 🗑
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| What term is a recommendation that is required to meet accepted standards? | show 🗑
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| show | Should
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| Which of the following do not effect patient exposure... 3 phase generators, collimation, target to panel distance, exposure time? | show 🗑
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| A high radiation area is any area accessible by individuals in which there exists any radiation an individual could receive in any 1 hour a dose to the whole body in excess of how many rem? | show 🗑
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| A radiation area is any area accessible to personnel in which there exists radiation at such levels that a major portion of the body could receive in any 1 hour a dose in excess of how many rem? | show 🗑
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| show | An area in which radiation safety rules are enforced.
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| Which of the following is record keeping not required for... results for each calibration survey & test, each reciept transfer & disposal of an x-ray machine, each RT who is hired by the hospital, radiation exposure monitoring of required individuals. | show 🗑
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| The rad is a unit of what? | show 🗑
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| show | high kVp, low mAs
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| the rem is a unit if what? | show 🗑
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| show | The Gray
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| The SI unit analagous to the rem is what? | show 🗑
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| When electrons strike the target of an x-ray tube most of the energy is converted to what? | show 🗑
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| show | The thickness of a specified substance which reduces the exposure rate of the primary beam by one half
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| What is Vignetting? | show 🗑
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| What is the approximate exposure in rads a patient would receive during 5 minutes of fluoroscopy. | show 🗑
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| A protective drape, or sliding panel of a minimum thickness of what lead equivalent should be positioned between fluoroscopist and patient to absorb scattered radiation? | show 🗑
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| Should film badges be wirn under the lead apron at gonadal level? | show 🗑
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| show | No
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| Which of the following types of cells is most sensitive to the effects of radiation..... Muscle, brain, red bone marrow, skin? | show 🗑
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| show | Leukemia
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| show | To perceive fine detail
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| show | Quantum mottle
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| show | Image contrast
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| Automatic Brightness Stabilization is designed to compensate for changes in what? | show 🗑
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| show | 1-5 mA
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| show | 97%
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| show | Lead glass protective goggles and glasses.
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| show | Improper collimation
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| Which of the following are tru about fluoroscopic imaging.. increase kVp increases contrast, increase mA reduces patient dose, reducing kVp increases patient dose, reducing mA increases contrast? | show 🗑
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| A strong correlation exists between the incidence of leukemia and the mean radiation dose received by which.... gonads, thyroid, bone marrow, skin? | show 🗑
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| Stray x-radiation comes from the x-ray tube housing is called what? | show 🗑
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| Which of the following is not a personnel monitoring device.... Geiger counters, pocket chamber or dosimeter, TLD, film badge? | show 🗑
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| The most common material used in TLD is which of the following.... Calcium Fluoride, Potassium Fluoridentrous Oxide, Lithium Fluoride, Nitrous Oxide? | show 🗑
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| Which of the following is the input phosphor of modern II made of..... Zinc Cadmium Sulfide, Sodium Iodide, Cesium Iodide, Calcium Tungstate? | show 🗑
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| What are the 3 basic principles which may be used singly, or in combination to reduce dose to x-ray? | show 🗑
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| show | 1/4
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| Diagnostic type tube housing means that when tube is operated leakage radiation at a distance of 1 meter from the target cannot exceed how many mrad? | show 🗑
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| show | May not be operated at less than 12" (30cm) source to skin distance
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| The resolution of the modern input phosphor of an II in non magnification mode is what lp/mm? | show 🗑
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| show | Zinc Cadmium Sulfide
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| show | Patient dose & image quality
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| show | The electrostatic lenses are responsible for focusing the electron field.
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| show | Brightness Gain
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| show | The Kell Factor
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| show | 525
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| show | The number of x-ray photons absorbed by the system
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| Which of the following recording systems has the poorest resolution.... CONE, VHS, Spot Filming, Videodisc Recording? | show 🗑
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| show | Poor radiation practices by the occupational worker.
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