Diagnostic Imaging Flashcards
VTNE
Which of the following is used to reduce the amount of scatter when looking at radiographs: kVp, mAs, Beam, or Grid?
Grid - The grid is a filtering device that reduces the amount of scattered radiation, creating a clearer diagnostic image.
How does an interstitial lung pattern appear on a radiograph: rings and lines, dark open space, crosshatched lines, or hazy and indistinct?
Hazy and indistinct - because an interstitial lung pattern occurs when the patient’s disease is located in the tissues outside of the air-containing spaces. This creates a haze, and the lungs appear cottony and indistinct.
Rings and lines appear with a bronchial pattern.
True or false, during an X-ray, the technician is the most significant cause of scatter?
False - The patient is the most significant cause of scatter during an X-ray. This effect may be worsened by patient movement. Differences in electron density cause X-ray scattering as well.
A veterinary technician is taking a radiograph of a patient’s urinary tract. What type of films will the technician need to take prior to examinations: A) Ventrodorsal and lateral films; B) Lateral, ventrodorsal, right ventrodorsal oblique, and left ventrodorsal oblique films; C) Lateral and oblique ventrodorsal films; D) Ventrodorsal, dorsoventral, right lateral, and left lateral films?
A) Ventrodorsal and lateral films
When viewing an ultrasound image, the veterinarian mentions that the structure in question is anechoic. What does the veterinarian mean by this?
The structure is dark and produces few, if any, echoes.
Nuclear medicine is an alternative imaging modality used in veterinary medicine. What is the primary radionuclide administration route used: Intradermal, Intravenous, Interarterial, or Intramuscular?
Intravenous
What is the term used to describe an X-ray study that involves injection of a dye into the spinal column: intravenous pyelogram, myelogram, splenoportogram, or angiogram?
Myelogram - Used to highlight relevant structures of the spinal column and diagnose intervertebral disc abnormalities or spinal cord injuries.
Which of the following will appear gray on a radiograph: bone, fluid, metal, or contrast media?
Fluid - Fluid, fat, and muscle appear gray on radiographs. Bone, metal, and contrast media appear white.
Which of the following radionuclides is used in thyroid scintigraphy: iodine, uranium, plutonium, and gadolinium?
Iodine - Isotopes of iodine are actively concentrated by the thyroid gland, making them ideal for evaluation of thyroid function. Technetium can also be used in thyroid scintigraphy.
In veterinary medicine, radiographic contrast agents are used to improve images by increasing the radiographic density difference between anatomic structures. Soluble ionic radiopaque mediums are one of the four types of contrast medias used. Which of the following is an example of a soluable ionic radiopaque medium: Iohexol, Carbon dioxide, Iothalamate, or Barium sulfate?
Iothalamate - Diatrizoate is another soluable ionic radiopaque medium. Iothalamate and diatrizoate are negatively charged contrast agents.
Carbon dioxide is a radiolucent gas. Barium sulfate is an insoluable inert radiopaque medium. Iohexol is a soluable nonionic radiopaque medium.
Veterinary technicians wear film badges in order to measure the amount of radiation they have been exposed to. According to the U.S. Nuclear Regulatory Commission, what is the maximum permissible dose of radiation an individual should be exposed to in a 13-week quarter: 1.25 rem, 2.50 rem, 3.75 rem, or 5.00 rem?
1.25 rem - A film badge reports exposer using milirem (mrem), which would equate to 1250 mrem for a 13-week quarter. The maximum permissible dose of radiation for an entire year is 5.00 rem, or 5000 mrem.
Which of the following markers are always seen on radiographs taken in dorsoventral radiographs: P (proximal) and D (distal); M (medial) and L (lateral); D (dorsal) and V (ventral); or R (right) and L (left)?
R (right) and L (left) - When a radiograph is taken with the patient lying on his/her back or on his/her abdomen, the technician must mark the image in order to distinguish right from left.
