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vet science radiology

Terms

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copy deck
aplastic anemia
when bone marrow production stops
sievert (Sv)
dose of radiation equivalent to the absorbed dose in tissue (1= 100 rem)
throid gland
very susceptible to rays. immediately absorbs radiation- becomes hypothyroid. should be covered up during radiographs
fluoroscopy
special radiographic diagnostic method in which a "live view" of the internal anatomy is possible. manual restraint is needed
genetic damage
effects of radiation that occur to the genes of reproductive cells
somatic damage
damage to the body induced radiation that becomes manifest w/in the lifetime of the recipient
ALARA
as low as reasonably achievable, a program issued by NCRP to give a practical approach to radiation safety in the workplace
leukopoetic
anatomic areas that produce WBCs
dosimetry
various methods used to measure radiation exposure to a personnel
dosimeter
device used to measure radiation exposure to a personnel
cumulative effects of radiation
cancer, cataracts, prmature aging, alopecia, heart disease, heart disease, genetic mutations, erythema, aplastic anemia, sterility
thorax (sternal recumbent lateral view w/ horizontal beam)
used to confirm presence of fluid/ free air in the thoracic cavity & to assist its quntification. patient in sternal recumbency on top of a foam pad (5-10 cm thick), head & forelimbs are extended crainally, hind limbs in natural crouch, cassette is placed in vertical position against the lateral side of the patient, thorax is centered to the cassette. the field of view includes the manubrium sterni caudally to th 1st vertebral body (the entire thorax/ all the ribs)
secondary radiation (scatter radiation)
caused by interaction of the primary beam w/ objects in its path
thorax (ventrodorsal view)
provides a better view of the accessory lung lobes & cuadal mediastinum. DO NOT use on a patient w/ respiratory distress. patient is placed in dorsal recumbency w/ the forelimbs extended cranially. sternum must be superimposed over the spine (place a V trough/sandbags placed under pelvic region). field of view includes all ribs at peak inspiration
thermoluminescent dosimeter (TLD)
a method od dosimetry consisting of a chamber containing special compounds that become electrically altered by ionizing radiation
absorbed dose
quanity of energy imparted by ionizing radiations to matter
alopecia
hairloss
National Committee on Radition Protection & Measurements (NCRP)
defines the MPD for non/occupationally exposed personnel. a nonprofit organization, charted by congress and consists of scientific committees of persons
gray (Gy)
unit of absorbed dose imparted by ionizing radiations to matter (1= 100 rad)
dose equivalent
quanity obtained by multiplying the (absorbed dose in tissue) by the (quality factor)
pharynx (Lateral view)
patient is in lateral recumbency, forlimbs cuadal, head & neck extended cranially. sponge wedge placed under mandible- eliminates obliquity of the skull & frees the larynx from mandible (allows better view of the laryngeal region. the air passages are a negative contrast agent & permits the soft tissue of teh pharyngeal region to be differentiated. field of view includes entire area of the neck between the lateral cantus of the eye & the 3rd cervical vertebrae
primary beam
path that the x-rays follow after leaving the tube
hemopoietic
anatomic ares that produce RBCs
abdomen (ventrodorsal view)
patient is in dorsal recumbency, hind limbs postioned in normal flexion (A V trough/ sandbags placed under the thoracic region. field of view includes entire abdomen from diaphragm to the level of the femoral head during the peak of expiration
Maximum permissible dose (MPD)
maximum dose of radiation a person may recieve in a given time period
cataracts
cloudiness of the lens
abdomen (lateral view)
patient is placed in right (chosen to assist longitudinal seperation of the kidneys) lateral recumbency w/ the hindlimbs extended caudally (helps eliminate superimposition of the femoral muscles over the cuadal portion of the abdomen. use a foam pad between the femurs to eliminate rotation of the pelvis & cuadal abdomen. another foam pad placed under the sternum to elevate it to the same level as the thoracic spine. abdomen is centered on the cassette. field of view includes the diaphragm caudally to the femoral head during the peak of expiration
thorax (lateral decubitus view (ventrodorsal view w/ horizontal beam)
the lateral decubitus projection, used to confirm presence of fluid/ free air in the thoracic cavity & to assist its quntification. animal is in lateral recumbency on top of 5-10cm thick foam pad (needed to elevate the patient off the tabletop & allow visualization of both sides of the thorax, w/ horizontal x-ray beam directed ventrodorsally, forelimbs & head are extended cranially, hindlimbs are pulled slightly in a cuadal direction to keep the spine of the patient close to the cassette (behind the patient), thorax centered on the cassette, field of view includes the entire thorax
erythema
redness
thorax (dorsoventral view)
ensure the sternum is superimposed over the vertebral column. patient in sternal recumbency w/ thoracic vertebrae superimposed over sternum, forelegs are pulled slightly foward to prevent elbows being tuckedd under the thorax, head is lowered between the two forelimbs, feild of view includes all ribs during peak inspiration
thorax (lateral view)
provides a more accurate view of the cardiac silhouette. patient is in lateral recumbency, forelimbs extended cranially, extension of the forelimbs (eliminate superimposition of triceps & humeri over cranial aspect of thorax, hind limbs pulled slightly cuadally, head extended, sternum elevated (use a foam wedge pad) to level above the x-ray table equal to that of the thoracic vertebae, prevents rotation of the thorax. field of view includes the entire thoracic cavity form line of the manubrium sterni caudally to the 1st lumbar vertebral body (all the ribs)
barium sulfate
a radiopaque contrast medium, used in fluoroscopy
thorax (standing lateral view w/ horizontal beam)
used to confirm presence of fluid/ free air in the thoracic cavity & to assist its quntification. not as desirable- superimposition of the humeral soft tissues over the cranial thorax in a natural posture
film badge
method of dosimetry consisting of a plastic holder w/ radiation sensitive film in a light proof package
1st trimester (3months-cows/ 3weeks-dog)
the most dangerous period to be exposed to radiaton for a fetus
pocket ionization chamber
method of dosimetry consisting of a charged ion chamber & electrometer, which can be read immediatly to determine the amount of exposure

Deck Info

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