CAMRT Practice Exam 1 | 2023/24

CAMRT Practice Exam 1 | 2023/24 You receive a req on a 1yr old who is Dx with Talipes equinovarus. What body part should you expect to x-ray? - Feet What formula is used to calculate mAs when SID has been altered? - Old mAs/new mAs = old SID squared/new SID squared When doing single contrast barium enemas, what is the predominant type of electron interaction occurring in the patient? - Photoelectric What is an advantage of CT over conventional radiography? - Improved soft tissue differentiation Absorbed dose. Which is the most radiosensitive portion of the cell cycle? - Mitosis Millie is a tech. What is the maximum annual permissible whole body dose that can be registered on her OSL? - 20mSv What is the term used to describe breaks in chromosomes? - Aberrations In digital imaging, what is the relationship between the matrix and spatial resolution? - Direct What OID is required to optimize the air gap technique? - 10-15cm When reviewing previous images from a patient having a barium meal study, which exam would it be most important to bring to the attention of the radiologist? - *a. Barium enema done 2 days ago b. IVP done earlier that day c. Endoscopy without biopsy done 1hr ago d. CT chest booked immediately following 100cm SID changes to 120cm SID, original mAs was 5mAs. What is the new mAs? - 7.2 Need to do a femur series on a 17 year old female. When asked if she could be pregnant she says "I don't know i might be". What do you do? - Determine if pt is in the 10-day period after onset of menstruation An elderly woman unable to lay on her back or stand needs lumbar spine x-rays. Besides a routine lateral, what view should you consider? - Lateral decub with AP horizontal beam What should be included in an image looking for ulcerative colitis? - Rectosigmoid area T2/3 is at what level? - Sternal notch In an indirect capture digital unit, what is the function of the scintillation phosphor coating on a photodiode? - Cesium iodide is used to convert x-rays to light What is the relationship between the kV and half value layer? - As kV increases, the HVL decreases T or F to indicate when you would choose to increase the SID from the dept standard -Upright abdomen on a large pt -Long bones to include both jts -Coned view of odontoid - T, T, F On which apparatus would a stationary grid be acceptable? - a. Cystoscopy table b. Angio unit *c. Trauma unit d. Mammo unit Which of the following most effectively minimizes radiation dose to the pt? - -Small focal spot -High mA stations -Large OID *-Collimation What consideration should be given to kV selection to improve image contrast? - Reduce kV to reduce Compton scatter reaching the IP Into what category of responsibility does the conscientious and accurate identification of pt's fall? - Legal For a 10 month old female, what is the correct application and ratio for breathing to compression during CPR? - 2 fingers, 1 breath to 15 compressions The average exposure factors for a comparable child using 100cm SID and non grids is 2mAs at 60kV. What is the suitable exposure for 160cm SID? - 2.5mAs 70kV (100-180 is 1.5, I guess 100-160 is like 1.25) Where should the end of an ET tube be visualized? - 2 inch superior to tracheal bifurcation (5-7 cm above bifurcation) What is the target respiratory rate for infant? - 30-60 breaths/min Sternal notch is at what level? - T2-3 L3 is at what level? - LCM CP for sacrum?