CT Domain 4: Procedures Welcome to your CT Domain 4: Procedures 1. CT: Procedures When performing a CT of the head, what is the optimal slice thickness to accurately detect small intracranial lesions? 1-2 mm 5-6 mm 8-10 mm 12-15 mm None 2. CT: Procedures In a CT abdominal scan, what is the primary reason for administering oral contrast? To reduce radiation exposure To enhance the visibility of the gastrointestinal tract To decrease the scanning time To enhance the visibility of the renal structures None 3. CT: Procedures For a CT pulmonary angiogram, what is the crucial timing aspect to ensure optimal contrast enhancement of the pulmonary arteries? Delayed phase after 60 seconds Arterial phase at 20-25 seconds Venous phase at 45-50 seconds Immediate phase within 5 seconds None 4. CT: Procedures In CT imaging, what is the primary advantage of using a helical (spiral) scan over a conventional step-and-shoot technique? Lower radiation dose Shorter scan time Improved spatial resolution Easier patient positioning None 5. CT: Procedures When performing a CT scan of the abdomen, why is it important to instruct the patient to hold their breath during the scan? To prevent the machine from moving To reduce the risk of radiation exposure To avoid motion artifacts To enhance contrast uptake None 6. CT: Procedures What is the significance of using a lower tube voltage (kVp) in pediatric CT imaging? Increases image noise Reduces radiation dose Enhances contrast resolution Decreases image acquisition time None 7. CT: Procedures In CT imaging, what parameter adjustment is essential when scanning a patient with a metallic implant to reduce artifact? Increase the tube current (mA) Decrease the slice thickness Increase the tube voltage (kVp) Decrease the field of view None 8. CT: Procedures During a CT scan of the chest, what is the key reason for using a high-resolution algorithm? To increase the scan speed To reduce patient radiation dose To improve visualization of lung parenchyma To decrease the need for contrast media None 9. CT: Procedures Why is it important to use a non-ionic, iso-osmolar contrast agent in patients with renal impairment undergoing a CT scan? To enhance image quality To prevent contrast-induced nephropathy To reduce scan time To increase patient comfort None 10. CT: Procedures What is the main purpose of utilizing dual-energy CT (DECT) in imaging of gouty arthritis? To reduce scanning time To decrease radiation dose To differentiate between uric acid and calcium crystals To improve the spatial resolution None 11. CT: Procedures In a cardiac CT scan, why is beta-blocker administration recommended prior to the procedure? To increase heart rate To decrease heart rate To enhance contrast resolution To reduce patient anxiety None 12. CT: Procedures For a CT enterography procedure, why is it necessary for patients to ingest a large volume of neutral oral contrast? To dilate the bowel and improve lesion detection To reduce the radiation dose To decrease the scan time To enhance renal visualization None 13. CT: Procedures In CT perfusion imaging of the brain, what parameter is primarily measured to assess the extent of a stroke? Total brain volume Cerebral blood flow (CBF) White to gray matter ratio Skull thickness None 14. CT: Procedures Why is it important to administer intravenous contrast in a CT scan when assessing for pancreatic tumors? To increase scan time To improve visualization of the pancreas To reduce radiation exposure To enhance abdominal muscle delineation None 15. CT: Procedures What is the primary reason for using a saline flush after administering intravenous contrast in CT imaging? To reduce the total scan time To decrease the risk of allergic reactions To ensure maximum utilization of the contrast agent To increase patient comfort None 16. CT: Procedures In CT imaging, what is the advantage of using iterative reconstruction techniques over filtered back projection? Lower radiation dose Longer scan times Increased image noise Higher contrast media use None 17. CT: Procedures When performing a CT scan for a suspected appendicitis, why is it important to include the pelvis in the scan range? To assess for urinary tract involvement To evaluate potential lower abdominal pathologies To check for hip joint abnormalities To ensure complete visualization of the appendix None 18. CT: Procedures In a CT scan for lung cancer staging, why is it essential to include the liver and adrenal glands in the scan? To check for common metastasis sites To assess for unrelated hepatobiliary disease To evaluate kidney function To increase radiation dose efficiency None 19. CT: Procedures Why is it necessary to use a higher tube current (m when scanning a larger patient in CT? A) To reduce scan time To enhance image contrast To compensate for increased patient attenuation To decrease radiation dose None 20. CT: Procedures In a CT angiography 'CTA' of the chest, what is the importance of timing the contrast bolus? To highlight bone structures To reduce the need for sedation To enhance vascular structures at the optimal phase To decrease the volume of contrast used None 21. CT: Procedures What is the rationale for using a dual-phase CT scan in evaluating liver lesions? To assess bone density To evaluate lesion vascularity during different phases To decrease patient movement artifacts To reduce radiation exposure None 22. CT: Procedures In CT urography, why is it important to acquire images in the excretory phase? To visualize renal cortex thickness To assess the patency of the ureters To measure bladder wall thickness To evaluate bone structures adjacent to the urinary tract None 23. CT: Procedures Why is it critical to use ECG gating in cardiac CT imaging? To synchronize image acquisition with the cardiac cycle To enhance liver contrast To reduce the need for oral contrast To increase scan speed None 24. CT: Procedures When performing a CT scan of the spine, why is it essential to align the gantry parallel to the intervertebral discs? To reduce radiation dose to adjacent organs To optimize the visualization of disc spaces and spinal alignment To enhance the contrast of the spinal cord To decrease the scan duration None 25. CT: Procedures Why is it necessary to perform a non-contrast CT scan of the head prior to a contrast-enhanced study in patients with suspected acute stroke? To identify bone fractures To assess for the presence of hemorrhage To evaluate sinus patency To measure ventricle size None 26. CT: Procedures In CT imaging of the abdomen, why is a post-contrast delayed phase sometimes acquired after the initial contrast-enhanced phase? To evaluate bowel peristalsis To assess the washout characteristics of renal lesions To measure the liver size more accurately To check for immediate allergic reactions to contrast None 27. CT: Procedures Why is breath-hold instruction critical during a thoracic CT scan? To enhance the contrast resolution of the heart To minimize motion artifacts from breathing To decrease the scan time To reduce the radiation dose to the lungs None 28. CT: Procedures In a CT scan of the pelvis, why is it important to instruct the patient to empty their bladder before the procedure? To reduce the risk of radiation-induced cystitis To improve the visualization of pelvic structures To decrease the likelihood of patient movement To enhance the contrast differentiation of the bowel None 29. CT: Procedures For a patient undergoing a CT scan for suspected renal stones, why is a non-contrast scan typically preferred? To enhance the visualization of the ureters To prevent allergic reactions to contrast To differentiate renal stones from surrounding tissue To assess renal function None 30. CT: Procedures In the context of a multiphase CT scan of the liver, why is the arterial phase particularly important for detecting hepatocellular carcinoma? To observe the biliary tree more clearly To identify the liver's arterial supply and lesion hypervascularity To assess liver function To evaluate the portal venous system None 31. CT: Procedures Why is it important to acquire a high-resolution chest CT (HRCT) at full inspiration? To reduce motion artifacts from the heart To enhance visualization of the airways and lung parenchyma To decrease the time required for the scan To minimize the radiation dose None 32. CT: Procedures In CT colonography, why is insufflation of the colon with air or CO2 necessary? To enhance the absorption of oral contrast To decrease the examination time To distend the colon for optimal visualization To reduce the radiation exposure to the patient None 33. CT: Procedures Why is it crucial to use a low kV setting in pediatric CT imaging? To enhance the visualization of soft tissues To increase the speed of image acquisition To reduce radiation dose To improve the detection of calcifications None 34. CT: Procedures What is the primary reason for performing a dynamic contrast-enhanced (DCE) CT in the evaluation of renal masses? To determine the mass's growth rate To assess the enhancement pattern of the mass To evaluate the renal excretory function To measure the size of the renal pelvis None 35. CT: Procedures Why is it beneficial to use automated tube current modulation (ATCM) in CT imaging? To enhance the image resolution To reduce image noise To decrease the contrast media volume To optimize radiation dose based on patient size None 36. CT: Procedures In the context of a CT-guided biopsy, why is needle trajectory planning essential? To ensure the fastest possible procedure To avoid critical structures and reduce complications To increase the needle visibility To minimize the amount of contrast used None 37. CT: Procedures Why is it important to perform a CT cystogram in the delayed phase after contrast administration? To evaluate the kidneys' function To assess bladder wall thickness To detect possible bladder leaks or injuries To observe the ureteral jet effect None 38. CT: Procedures For CT angiography of the aorta, why is the timing of contrast injection crucial? To highlight lymph node structures To ensure optimal enhancement of the aortic lumen To visualize the surrounding soft tissues better To reduce the overall radiation dose None 39. CT: Procedures Why is it important to monitor the patient's renal function before administering iodinated contrast in a CT scan? To prevent contrast-induced nephropathy To enhance the contrast's effectiveness To reduce the likelihood of motion artifacts To determine the appropriate scan delay None 40. CT: Procedures In a CT scan assessing for acute ischemic stroke, why is it vital to differentiate between grey and white matter? To determine the age of the stroke To identify the presence of hemorrhage To assess cerebral atrophy To evaluate the extent of ischemic damage None 1 out of 40 Time is Up! Time's up
