Final

T/F QC program should include acceptance testing, routine performance monitoring and matainance

With image intensification the light level is raised to what kind of vision-

Visual acuity in eye is created where

Radiation that exits tube and enters patient reacts to what first?

where does the photons go after hitting the input phosphor

Ratio of number of light photons exiting outer phosphor to xrays at inter phosphor is called?

how much mA is used during fluoro

ABC maintains brightness of image by varying what technique factors

Quality assurance monitors what?

T/F Quality control program is for CT scanners, xray tubes

T/F 3 reasons medical facilities have quality control programs in place to have joint commission approval and accredidation, ensure quality patient care, and recieve patient insurance payment

All general purpose radiographic units must have a minimum filtration of?

collimator must be accuratly aligned to within +/- what % of SID

federal law states minimum skin exposure must not exceed how many rad per minute during a normal fluoroscopy

T/F patient dose limit for ct examinations is 10 rads per exam

incorrect patient positioning on a digital image would be classified as this type of digital radiography artifact: image receptor, software or object

T/F Artifact can be object that is not part of radiographed anatomy, patient motion, or improper grid or cassette

Ghosting artifact on image would be classifed as this type of artifact: image receptor, software, object

largest number of repeat exams are usually caused by what type of artifact?

when gridlines superimpose with pixel lines and rows, what kind of artifacts occur?

ghost image can occure in digital image because of what?

dust on digital image would be classifed as this type of artifact? image receptor, software, object

improper image compression would be classified as this type of artifact: image receptor, software, object

which of these is considered an artfact on an image? prosthesis, shrapnal, necklace, swallowed coin

human body is composed of 80% of what

dna is located in which part of cell

metabolic process of building large molecules from small ones is called what?

all the hereditary information about an individual is contained in which cell?

2 major parts of the cell is nucleus and what?

cell engine is what?

meiosis is cell division for which cell

T/F tissue in bone marrow is more radiosensitive than skin tissue

T/F lowest amount of radioactivity in which most radiosensitive tissue will respond is 2Gy (200 rad)

T/F tissue that mature with low metabolic rate are more radiosensitive

protraction and fractionation are used for radiation therapy because they allow the patient to what?

humans are most radiosensitve during what stage of cellular development

T/F human cells cannot recover from radiation dmg after there is cell death

T/F QC program should include acceptance testing, routine performance monitoring and matainance

response to radiation that is directly proportional to dose recieved is what? linear or nonlinear

if response to radiation is expected no matter how small dose, then response is threshold or nonthreshold

T/F type of dna dmg that may not be reversable is base change or loss

most radiosensitive macromolecule is what

T/F radiation dmg to dna can result in cell death, malignant disease, and genetic changes

T/F molecular lesions of dna are called point mutations

the principle radiation interaction with the human body is with what

T/F free radicles can be dmging because they are unstable and highly reactive

indirect affect on ionizing radiation occurs on what molecule

ionizing effects from irradiation are considered direct effects if they occur with what molecule

T/F lethal effects of cell irradiation are measured by cell death

principle radiation interaction within the human body are assumed to be what? indirect or direct

the disassociation of water molecules following radiation are termed what

T/F CNS syndrome occur during whole body dose of 50Gy or more (5000rad)

T/F a dose of 25 rad to a small area of body can cause erythema

usually a what before a symtom of acute radiation syndrome appear

T/F most likely response to a whole body dose of 2 Gy would be diarrhea nausea and vomitting

destruction of which cells in intestinal lining causes death from GI syndrome

LD50/60 for humans is approx how many Gy?

overies are most radiosensitive during which stage of life?

gonadal responses to radiation have been observed to doses of how many rads

most radiosensitive cells in the hematopoietic system of the human body are what?

T/F A single chromosome aberration represents severe damage to the DNA within the chromosome

T/F High doses of radiation to a localized area can lead to reduction in size shrinkage and total malfunction of tissues and organs in that area

T/F Radiation protection guidelines are based on what? late effects or the early effects of radiation

what is best way to hold down patients who are unable to support themselves

true or false it is difficult to link cancer to radiation exposure because it occurs in the higher proportion in the population

T/F Low doses of radiation have been shown to cause chromosome dmg

a study of an irradiated population that showed a relative risk below 1.0 would indicate the population had what type of risk are reduced or a very high risk reduced

The most radiosensitive period During pregnancy for radiation induced congenital abnormalities is during what stage would it be the first second or third

The dose for cataract formation is known the how many gray of acute exposure to the eye

which of following are late effect of radiation exposure cancer or nausea

which of following increases the instances but not severity as dose increases

people who had exposure to their thymus glad as children later showed excess risk to which type of cancer

first group of radiation health physicist worked with what?

what are the 3 cardinal prinicples of radiation protection

T/F 10th value layer is equal to 3.3 HVL

T/F dose limit for general public is half dose limit for occupational exposure

what is annual affected dose limit for occupational exposure

T/F pregnant patient cant be radiographed under any circumstances

reccommended dose limit for pregnant tech is how many mRem per month

T/F reasonable safeguard against accidental radiation of pregnant patient is to post warning signs in department

what is best approach to occupational exposure

T/F leakage radiation limit for xray tubes is less than 100mR/h @ 1m of tube housing

fluoroscopic control switch is always what type of switch

T/F accumulative timer is designed to turn off every 5 minutes

primary radiation is considered what? scatter or useful beam

secondary barrier is designed to absorb what kind of radiation

most accurate and sensitive personnel device monitoring device with wide range of sensitivity is what device

T/F patient dose can be considered entrance skin exposure, mean marrow dose, and gonadal dose

T/F high occupational exposure of diangostic x-ray personal occurs during both fluoro and mobile

T/F a technologist can reduce his or her exposure during fluoro by standing close to the patient's head

minimum allowable thickness of protective apron is how much lead?

what is best way to hold down patients who are unable to support themselves