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ASRT EXAM 2025 LATEST REAL
QUESTIONS AND CORRECT ANSWERS
GRADE A
Helical scanning motion was first made possible by the unique construction of the ____________ scanner. A) fourth generation B) fifth generation C) sixth generation D) seventh generation
- CORRECT ANSWER - > 7th The type of beam geometry used in modern CT scanners is called: A) fan beam. B) wide beam. C) pencil beam. D) cone beam. - - CORRECT ANSWER
cone beam The ___________ method of data acquisition gathers image data in distinct sections and is sometimes describes as having a "start/stop" motion. A) spiral B) sequential C) helical D) volume - - CORRECT ANSWER - > sequential When pitch is less than 1, the resulting bands of data are: A) adjacent. B) distinct. C) overlapped. D) gapped - - CORRECT ANSWER - > overlapping Which of the following is not a component of the CT gantry? A) X-ray tube B) Array processor C) Slip rings D) Digital acquisition system -
- CORRECT ANSWER - > array processor Detector systems in which the elements are not all the same size are referred to as: A) adaptive arrays. B) volumetric arrays. C) symmetric arrays. D) unbalanced arrays. - - CORRECT ANSWER - > adaptive arrays
All of the following are characteristics of beam-shaping filters, except: A) they are physical devices. B) they change the spatial distribution of the beam. C) they change the digital appearance of images. D) they remove lower-energy x-rays from the beam. - - CORRECT ANSWER - > they change digital appearance of images The primary data processing component of the CT system is the: A) array processor. B) digital acquisition system. C) PACS. D) amplifier. -
- CORRECT ANSWER - > array processor An increase in pitch also results in increased: A) patient dose. B) scan speed. C) image quality. D) scan length. -
- CORRECT ANSWER - > scan speed The largest piece of the CT device is called: A) the gantry. B) the processor. C) the housing. D) the ring. - - CORRECT ANSWER
gantry When considering detector efficiency, the measure of how consistently the detectors respond is called: A) capture efficiency. B) absorption efficiency. C) stability. D) response time. - - CORRECT ANSWER - > stability Which component of the CT gantry supplies electrical power to the x-ray tube and transfers the signals from the detectors to the computer? A) Generator B) Slip rings C) Photomultiplier D) Data acquisition system -
- CORRECT ANSWER - > slip rings The first generation CT scan pattern was called _______ acquisition. A) translate and rotate B) step-and-shoot C) helical D) linear -
- CORRECT ANSWER - > translate and rotate
The element of a photomultiplier tube that converts the initial pulse of light to electrons is the: ' A) semiconductor. B) photocathode. C) dynode. D) scintillator. -
- CORRECT ANSWER - > photocathode The ability of a detector to produce the same output given the same input is called its: A) reproducibility. B) efficiency. C) stability. D) dynamic range. -
- CORRECT ANSWER - > reproducibility Compared to helical scanning, axial scanning is associated with reduced: A) misregistration artifact. B) stair-step artifact. C) partial volume averaging. D) low-contrast resolution. - - CORRECT ANSWER - > low contrast resolution The main goal of dual source CT is improved ________ resolution. A) spatial B) temporal C) low-contrast D) high-contrast - - CORRECT ANSWER - > spatial During analog-to-digital conversion, the _______ selects segments of the analog signal for further analysis. A) sampler B) quantizer C) coder D) digitizer - - CORRECT ANSWER - > sampler During data processing, undersampling of the analog signal can result in: A) ring artifact. B) aliasing artifact. C) misregistration artifact. D) noise artifact. - - CORRECT ANSWER - > aliasing artifacts The traditional method used to reconstruct CT images is called: A) simulation. B) raw data processing. C) backprojection. D) iterative reconstruction. - - CORRECT ANSWER - > back projection Increasing pitch:
A) provides more scan data. B) reduces the need for interpolation C) compresses the helical coils. D) decreases spatial resolution. - - CORRECT ANSWER - > decreases spatial resolution An organized set of ray sums collected from multiple angles is called a(n): A) image. B) projection. C) view. D) attenuation profile. - - CORRECT ANSWER - > view What is the standard technique for image reconstruction immediately following the scan? A) Filtered backprojection B) Gray-scale manipulation C) Interlaced sampling D) Linear interpolation - - CORRECT ANSWER - > filtered backprojection ______ is a mathematical equation that is applied to reconstruct the data acquired by a single-detector row scanner. A) Filtered backprojection B) Gray-scale manipulation C) Interlaced sampling D) Linear interpolation - - CORRECT ANSWER - > linear interpolation The ability of the CT scanner to accurately merge image data from multiple, overlapping acquisition data sets is called: A) interpolation. B) interlaced sampling. C) partial volume averaging. D) z-axis filtering. - - CORRECT ANSWER - > interlaced sampling Adjusting the window level changes the _______ of an image. A) brightness B) contrast C) density D) resolution - - CORRECT ANSWER - > brightness Which postprocessing technique is used to enhance the darkest (low density) shades within the scan? A) Maximum intensity projection B) Minimum intensity projection C) Shaded surface rendering D) Volume rendering - - CORRECT ANSWER - > MINip Which of the following is true regarding an edge enhancement kernel?
_______refers to the ability of the CT scanner to consistently assign the same Hounsfield unit number to the same material. A) Reproducibility B) Uniformity C) Linearity D) Stability - - CORRECT ANSWER - > uniformity All of the following result from an increase in mAs, except: A) reduced noise. B) reduced scan time. C) increased x-ray quantity. D) increased patient dose. - - CORRECT ANSWER - > reduced scan time All of the following factors usually increase beam hardening, except: A) thicker anatomy. B) denser structures. C) use of contrast agents. D) use of reconstruction filters - - CORRECT ANSWER - > use of recon filters For __________, all of the anatomy is scanned but only the images acquired during diastole are used. A) prospective gating B) ECG gating C) retrospective gating D) respiratory gating -
- CORRECT ANSWER - > retro gating ______ artifacts result from faulty detectors and are seen only with third generation and newer CT scanners. A) Cone B) Edge gradient C) Out-of-field D) Ring - - CORRECT ANSWER - > ring Artifacts occurring due to patient anatomy on the periphery of the scan field are called: A) out-of-field artifacts. B) edge gradient artifacts. C) high-frequency artifacts. D) low-frequency artifacts. - - CORRECT ANSWER - > out of field artifacts When performing the slice width test, the acceptance limit for a 5-mm slice is: A) ± 0.1 mm. B) ± 0.5 mm. C) ± 1.0 mm. D) ± 1.5 mm. - - CORRECT ANSWER - > 1.0mm Which of the following substances has the highest atomic number? A) Muscle B) Water C) Fat D) Bone - - CORRECT ANSWER - > bone
__________ result from an interaction between an x-ray photon and an atom in tissue that causes the trajectory of the photon to be altered. A) Compton interactions B) Coincidence interactions C) Photoelectric interactions D) Photodisintegration interactions - - CORRECT ANSWER - > compton The SI unit for absorbed dose is the: A) roentgen. B) rem. C) gray. D) sievert -
- CORRECT ANSWER - > gray Which of the following statements regarding the CT Dose Index (CTDI) is false? A) It is a more efficient estimate of the multiple scan average dose. B) It is used to estimate the expected radiation output for an exam. C) It represents the amount of radiation absorbed by the patient. D) It is used for comparing radiation output between scanners. - - CORRECT ANSWER - > c The FDA-recommended threshold dose alert value is: A) 500 mGy. B) 1,000 mGy. C) 1,500 mGy. D) 2,000 mGy. - - CORRECT ANSWER - > 1, All of the following are recommended to minimize exposure, except: A) using kVp appropriate for patient size. B) using adult settings for pediatric scans. C) using automatic voltage features. D) correctly centering the patient. - - CORRECT ANSWER - > using adult settings for peds scans If all other factors are constant, which of the following adjustments will decrease patient dose? A) Increasing kVp B) Increasing mA C) Increasing pitch D) Increasing scan time -
- CORRECT ANSWER - > ^ pitch A larger detector configuration:
In the case of extravasation, the first step is to: A) stop the injection. B) apply a cold pack. C) apply a hot pack. D) raise the arm above the heart. - - CORRECT ANSWER - > stop the injection Which of the following is true regarding the use of patient restraints? A) They are removed when the imaging exam ends. B) They include Velcro straps, cushions, and sandbags. C) They are primarily used to achieve correct exam positioning. D) They must be prescribed according to facility policy. - - CORRECT ANSWER - > They must be prescribed according to facility policy. The most common CT exam performed on pregnant patients is: A) brain scan for stroke. B) chest scan for pulmonary embolism. C) lower extremity scan for deep vein thrombosis. D) abdominal scan for kidney stones. - - CORRECT ANSWER - > chest scan for pulmonary embolism. Which of the following is considered a mild reaction to IV contrast? A) Vomiting B) Hives C) Dyspnea D) Anaphylaxis - - CORRECT ANSWER - > vomiting Atropine sulfate is commonly included in crash carts to: A) treat ventricular arrythmia. B) increase heart rate. C) open airways. D) treat angina. - - CORRECT ANSWER - > increase HR When connecting a patient to the ECG gating monitor, the black or LA electrode attaches: A) below the right clavicle. B) at the lower edge of the right rib cage.
C) below the left clavicle. D) at the lower edge of the left rib cage. - - CORRECT ANSWER - > below left clavicle Which renal function test takes into consideration the patient's age, gender, and race? A) BUN B) Creatinine C) PTT D) eGFR - - CORRECT ANSWER - > eGFR A lower-than-normal prothrombin time indicates: A) increased bleeding risk. B) heart muscle damage. C) slow blood clotting. D) quick blood clotting - - CORRECT ANSWER - > quick blood clotting All of the following are true of high osmolar contrast media, except: A) it does not dissociate in solution. B) it has an osmolality 5 to 8 times higher than blood. C) it is generally less expensive than non-ionic contrast media. D) it has a relatively higher risk of adverse patient reactions. - - CORRECT ANSWER
doesnt dissociate in solution IV contrast is contraindicated in patients with: A) infection. B) acute trauma. C) pancreatitis. D) vascular stenosis -
- CORRECT ANSWER - > acute trauma After _______, no measurable contrast remains in the breastmilk of lactating patients. A) 8 hours B) 12 hours C) 24 hours D) 48 hours - - CORRECT ANSWER - > 24 During the venipuncture process, the initial needle puncture is at a ________ angle until blood returns in the needle. A) 10- to 20-degree B) 15- to 30-degree C) 30- to 45-degree D) 45- to 60-degree -
- CORRECT ANSWER - > 15 - 30 The pressure limit for a CT power injector is typically around:
A) water. B) blood. C) glucose. D) sodium chloride. - - CORRECT ANSWER - > blood The frontal and parietal lobes of the brain are separated from the temporal lobe by the: A) sylvian fissure. B) precentral gyrus. C) longitudinal fissure. D) central sulcus.
- CORRECT ANSWER - > sylvian fissure The arrow on the image below points to the: A) middle cerebral artery. B) internal carotid artery. C) basilar artery. D) vertebral artery. - - CORRECT ANSWER - > basilar artery The larynx terminates at approximately the level of: A) C5. B) C6. C) C7. D) T1. -
- CORRECT ANSWER - > C Which of the following arteries branches directly from the aortic arch? A) Right common carotid artery B) Left common carotid artery C) Right vertebral artery D) Left vertebral artery - - CORRECT ANSWER - > left CCA The arrow on the image below points to the: A) brachiocephalic artery. B) azygos vein. C) esophagus. D) aorta. - - CORRECT ANSWER - > brachiocephalic artery. Most of the anterior surface of the heart is formed by the: A) right atrium. B) left atrium. C) right ventricle. D) left ventricle. -
- CORRECT ANSWER - > right ventricle The arrow on the image below points to the: A) hemiazygos vein. B) aorta. C) thoracic duct. D) azygos vein. - - CORRECT ANSWER - > azygos vein. Which of the following is classified as a superficial back muscle?
A) Levator scapulae B) Rhomboideus major C) Latissimus dorsi D) Rhomboideus minor - - CORRECT ANSWER - > Latissimus dorsi The distal transverse colon, descending colon, sigmoid colon, and rectum receive blood supply from the: A) internal iliac artery. B) superior mesenteric artery. C) celiac artery. D) sacral artery. - - CORRECT ANSWER - > superior mesenteric artery When performing a scan of the abdomen from superior to inferior, the ______ is the first part of the pancreas to become visible. A) head B) neck C) body D) tail - - CORRECT ANSWER - > tail Which of the following is a common indication for a contrast-enhanced CT of the head? A) Headache B) Stroke C) Trauma D) Aneurysm - - CORRECT ANSWER - > aneurysm For a CT exam of the head, the patient's __________ should be positioned parallel to the axial scan plane. A) glabellomeatal line B) orbitomeatal line C) infraorbitomeatal line D) acanthiomeatal line - - CORRECT ANSWER - > orbitomeatal line Slice thickness for a routine neck exam is typically set to: A) 0.75 to 1 mm. B) 1 to 2 mm. C) 2.5 to 3 mm. D) 3 to 5 mm. - - CORRECT ANSWER - > 2.5- 3mm A lumbar spine scout image should start at the level of the: A) manubrium. B) xiphoid process. C) 7th rib. D) inferior costal angle. -
For a CTA of the abdomen and pelvis, the bolus tracking reference location should be placed in the: A) main pulmonary artery. B) aortic arch. C) ascending aorta. D) descending aorta.
- CORRECT ANSWER - > descending aorta In CT urography, renal masses and renal parenchymal abnormalities are best demonstrated in the: A) native (unenhanced) phase. B) nephrogenic phase. C) excretory phase. D) delayed phase. - - CORRECT ANSWER - > nephrogenic phase The most common condition requiring a contrast-enhanced liver CT in the adult population is: A) hepatocellular carcinoma. B) hemangioma. C) hepatoblastoma. D) hepatic mass. - - CORRECT ANSWER - > hepatocelullar carcinoma In a multiphase liver study, enhancement of the hepatic vein and parenchyma is best demonstrated in the: A) native (unenhanced) phase. B) late arterial phase. C) late portal venous phase. D) delayed (equilibrium) phase. - - CORRECT ANSWER - > late portal venous phase In multiphase pancreatic imaging, optimal pancreatic enhancement is demonstrated in the: A) native (unenhanced) phase. B) early arterial phase. C) late arterial phase. D) portal venous phase. - - CORRECT ANSWER - > late arterial phase For CT cystography, the patient's bladder is distended with at least _______ of diluted contrast media. A) 250 mL B) 350 mL C) 450 mL D) 550 mL -
- CORRECT ANSWER - > 350 The scan range for CTA of the carotid arteries begins: A) at the level of T4. B) below the aortic arch. C) just above the celiac artery. D) at the top of the chest. - - CORRECT ANSWER - > below the arch
All of the following are true of ECG gating for CTA of the aorta, except that it: A) uses a slower pitch. B) results in longer scan times. C) requires more IV contrast. D) is recommended to image the entire aorta. - - CORRECT ANSWER - > is recommended to image the entire aorta. Following liver transplant, the 7-day postoperative liver volume for donors and recipients is approximately: A) 35%. B) 60%. C) 75%. D) 90%. - - CORRECT ANSWER - > 75% The perfusion parameter most closely associated with identifying the volume of brain at risk in an acute infarction is: A) mean transit time. B) time to peak. C) cerebral blood flow. D) cerebral blood volume - - CORRECT ANSWER - > mean transit time The CT dose index volume per scan for CT brain perfusion is approximately _____ of a routine brain scan. A) one-half B) one-fourth C) one-eighth D) onetenth - - CORRECT ANSWER - > 1/ All of the following are true of ablation therapy procedures, except that they: A) have reduced morbidity and mortality compared to surgery. B) do not require sedation or anesthesia. C) can be performed on an outpatient basis. D) can be repeated over time. - - CORRECT ANSWER - > does not require sedation/anesthesia Radiofrequency ablation systems emit high-frequency electrical current in the range of: A) 120 to 260 kHz. B) 340 to 400 kHz. C) 460 to 500 kHz. D) 650 to 710 kHz. - - CORRECT ANSWER - > 460 - 500 Dual-energy CT scans can be obtained simultaneously with acquisitions at 80 kVp and: A) 110 kVp. B) 120 kVp. C) 130 kVp. D) 140 kVp. - - CORRECT ANSWER - > 140
All of the following are true regarding the CT system used for radiation therapy simulation, except that: A) it has a narrower aperture. B) it has a flat patient table. C) the Hounsfield units are calibrated by the medical physicist. D) it has an extra set of targeting lasers. - - CORRECT ANSWER - > narrower aperture Bone has a CT number of approximately: A) - 1000. B) - 100. C) 100. D) 1000. - - CORRECT ANSWER - > 1000 Which of the following is characteristic of left-sided heart failure? A) Upper extremity edema B) Lower extremity edema C) Fluid backup in the abdomen D) Fluid backup in the lungs - - CORRECT ANSWER - > fluid backup in the lungs All of the following are CT findings associated with pulmonary edema, except: A) vascular engorgement. B) cardiomegaly. C) lung abscess. D) septal thickening. - - CORRECT ANSWER - > lung abscess Abnormal collection of air in the pleural space is called: A) pneumonia. B) pulmonary effusion. C) pneumothorax. D) pulmonary bullae. - - CORRECT ANSWER - > pneumothorax Pulmonary embolism typically occurs because of: A) increased blood pressure in the pulmonary arteries. B) alveoli becoming deflated or filled with fluid.
C) a blood clot in a deep vein breaking loose and traveling to the lung. D) increased pressure in the heart pushing fluid into interstitial spaces of the lung.
- CORRECT ANSWER - > blood clot in a deep vein The most common type of hernia is: A) inguinal hernia. B) diaphragmatic hernia. C) incisional hernia. D) congenital hernia. - - CORRECT ANSWER - > inguinal All of the following are symptoms of uncomplicated diverticulitis, except: A) bloating. B) irregular defecation. C) abdominal cramping. D) rectal bleeding. - - CORRECT ANSWER - > rectal bleeding The presence of stones within the gallbladder is called: A) cholecystitis. B) cholelithiasis. C) choledocholithiasis. D) cholestasis. -
- CORRECT ANSWER - > cholelithiasis Which type of aneurysm balloons out on only one side of the vessel? A) False aneurysm B) Fusiform aneurysm C) Saccular aneurysm D) Pseudoaneurysm - - CORRECT ANSWER - > saccular A mass or growth composed of an abnormal collection of blood vessels is called a(n): A) thrombus. B) hemangioma. C) embolism. D) aneurysm. -
- CORRECT ANSWER - > hemangioma Which type of lymphoma has the highest survival rate?
