ARRT Computed Tomography (CT) Registry Practice Test

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• What does the scan factor measured from the center of the patient to the most distant edge of the patient refer to?
• What describes an x-ray beam in which all photons have the same energy?
• What term describes the dose for the entire series of images produced in a CT scan?
• What is the term for the combined thickness of all sections acquired simultaneously in MSCT?
• What defines a method of describing the strength of radiation exposure compared with the amount of noise in a digital image?
• What term describes the time between the initiation of contrast administration and CT data acquisition?
• What does the term "effective dose" correlate with in radiology?
• What type of artifact is associated specifically with Multi-Detector Computed Tomography (MDCT)?
• Which sign is NOT typically associated with shock?
• What effect does quantum noise/mottle have on an image?
• Which type of gating allows for heart-rate variability compensation during imaging?
• What type of MSCT detector utilizes multiple detectors in the longitudinal direction?
• What does "section width" refer to in the context of CT imaging?
• What type of measurements do detectors obtain to mathematically reconstruct a CT image?
• What is the first step in the three-step process of iterative reconstruction?
• Which of the following is a common use of CT imaging in emergency medicine?
• In the context of liver imaging, what does the equilibrium phase refer to?
• What characteristic can affect the clarity and sharpness of a CT image?
• In CT scans, the phase characterized by peak arterial enhancement occurs after the administration of what?
• What is an example of an Iso-osmolar Contrast Medium (IOCM)?
• Which term refers to the control of the diameter of the circular data acquisition field within the CT gantry?
• In CT terms, what does the term 'artifact' refer to?
• What is referred to as noise on a CT image?
• What type of system features a single row of detectors capable of acquiring only one image section for each gantry rotation?
• What happens to the display size when the DFOV of the reconstruction is increased?
• What is the primary point processing technique that uses a look-up table to enhance contrast?
• What is the term for the production of light energy by a detector in response to absorbed x-ray energy?
• Which artifact is commonly seen in CT imaging and is caused by patient motion?
• What patient condition might ataxia indicate in a clinical assessment?
• What is the normal range for diastolic blood pressure?
• What process involves creating a 3D object using computer software to describe physical properties of an object?
• What does the term "voxel" stand for?
• What are the axial skeleton's main weight-bearing vertebrae?
• What term describes the capability of a CT detector to absorb and measure transmitted x-ray intensity?
• What effect does overbeaming help to minimize at the outer edges of the CT image?
• What is the term for the unwanted information in a CT image due to various factors, including photon insufficiency?
• At what level does the abdominal aorta bifurcate?
• What does increasing slice thickness do to the image quality?
• Which of the following is an example of a High-Osmolar contrast medium?
• What factors determine contrast resolution in CT imaging?
• What is another name for shaded surface display (SSD)?
• Which term describes the condition where streaking artifacts occur in CT scans?
• During the IR loop, what occurs after updating the image with raw data?
• What does the Voxel Dimension formula consist of?
• Which term best describes the appearance of static projections combined to form an image?
• During what phase does the CT scanner capture images when using prospective gating?
• What is the impact on magnification if you increase the display size?
• Which analytic methods are used in CT image reconstruction?
• What phase occurs between 70 and 90 seconds after the injection of a contrast agent in CT imaging?
• What is the name of the electronic components in a CT system responsible for measuring transmitted x-radiation absorbed by the detectors?
• What process allows for thin sections to be reconstructed at any point along the acquired z-axis volume?
• Which term is associated with interpolation in helical scanning?
• Which phase of the cardiac cycle does Ventricular Systole correspond with?
• What axis corresponds to the direction of data acquisition where the patient is positioned?
• What term describes the amount of energy absorbed per unit mass in radiological contexts?
• Which of the following is a characteristic of Low-Osmolar Contrast Media?
• What is used to describe the rate that a quantity of radiation passes through a unit area over unit time?
• What type of contrast media is classified as High-Osmolar contrast medium (HOCM)?
• Linearity in CT refers to the relationship of CT numbers to what?
• What is a dual-source CT system characterized by?
• Which method tracks the patient's heartbeat to make reconstructions during the relaxed phase?
• Which graph illustrates the broadening of section width that is inherent to volumetric (helical) CT acquisition?
• What does window width in CT imaging control?
• Structures involving the sella turcica are best imaged in which plane?
• What is the primary advantage of using multi-slice computed tomography (CT)?
• What effect does increasing the beam hardening have on image quality?
• Which type of CT scan is particularly useful for diagnosing pulmonary embolism?
• What occurs during the Valsalva Effect?
• What are the symptoms associated with mild contrast allergic reactions?
• What key aspect is applied in the IR loop after the initial image is produced?
• Which of the following is NOT a symptom of shock?
• What is the approximate measure of the radiation dose received in a single slice in CT imaging?
• How often should a CT machine be calibrated for optimal performance?
• What is the approximate relative risk from exposure to radiation measured in?
• What is used as an indication of renal function, typically ranging from 0.5-1.5 mg/dl?
• In the context of CT scans, what is an important factor that affects image quality related to the level of noise?
• What form of parallel processing is used by computers to improve computation speed?
• What indicates the presence of an inflammatory process around an organ in imaging?
• At which vertebral levels does the adult spinal cord end?
• What is known as the comprehensive MSCT exam of the chest, which evaluates cardiac and non-cardiac pain?
• Aliasing is an artifact caused by what issue during data acquisition?
• What critical condition can arise from severe contrast allergic reactions?
• What mathematical technique is employed to create images from multiple projection profiles?
• Which law describes what happens to photons as they travel through tissues based on attenuation?
• What characterizes a saddle pulmonary embolus?
• During a CT scan, which of the following is primarily responsible for generating the x-ray beam?
• Which filter is used to remove blurring artifact during back-projection in CT imaging?
• Atrial Systole occurs during which part of the cardiac cycle?
• What is the most commonly used radiopharmaceutical for PET imaging?
• What is Partial Volume Averaging?
• Which of the following is an example of Low-Osmolar contrast medium?
• What is the recommended flow rate for peripheral venipuncture at the hand/wrist?
• What is the function of a Threshold Setting in CT imaging?
• Which process creates artificial raw data in the iterative reconstruction loop?
• What term is used for a set of ray sums that are calculated in CT imaging?
• What term describes the quantity of x-ray photons passing through a specified area?
• MDCT uses what shape of beam during imaging?
• Low-Osmolar contrast medium (LOCM) is classified under which type of contrast?
• What imaging characteristic is essential in diagnosing conditions with x-ray imaging?
• What is a benign mass of smooth muscle, commonly referred to as a fibroid tumor?
• What type of artifact is not affected by the operator during imaging?
• Which classification of contrast shares the same osmolality as blood?
• What refers to the effect of radiation dose being applied before and after the intended volume in CT imaging?
• What phenomenon occurs when a detector continues to glow after radiation is turned off?
• What is the timing for the corticomedullary phase of renal enhancement?
• What imaging modality is utilized for assessing the lung parenchyma in detail?
• Which component reviews raw data and performs major image processing?
• Which artifact is characterized by a streak at the interface of high-density and lower-attenuation materials?
• What waveform corresponds with Cardiac Diastole in the cardiac cycle?
• What is the condition termed as a substantial decline in renal function after a patient receives IV contrast?
• What is the significance of using the effective dose metric?
• Which parameter increases the risk of quantum noise in an image?
• What is the standard angle for inserting a butterfly needle?
• Which type of artifact results from variations in detector alignment?
• Which artifact is specifically referred to as "step artifact" in imaging?
• What does the term 'field of view' (FOV) refer to in CT?
• What does the attenuation coefficient represent?
• What is the main benefit of using Nonionic Contrast agents in CT imaging?
• Which term refers to the hazy increase in fat density around an organ, indicating an inflammatory process?
• Which algorithm is used for cone beam correction in MSCT systems?
• What is the purpose of overbeaming in CT imaging?
• What effect occurs when x-rays lose energy while traveling through tissue?
• Which method is used to reduce dose to pediatric patients during CT scans?
• What term describes a lack of muscle coordination?
• What term describes unwanted appearance in multiplanar images, leading to loss of sharpness and detail?
• What term refers to the volume of tissue represented by a pixel in the matrix used to display the image?
• What describes a reconstruction that uses data from above and below a slice for helical scanning?
• Which value controls the brightness in a CT image?
• What are the three fundamental processes involved in iterative reconstruction algorithms?
• Which CT technique enhances the contrast of vascular structures?
• What does BUN stand for, which measures renal function by indicating nitrogen levels in the blood?
• What is the primary purpose of temporal resolution in CT imaging?
• Which multiplanar reformation technique displays only the maximum pixel value?
• What technique involves the construction of a 3D model by limiting displayed volumetric data?
• What does "steatosis" refer to in hepatic imaging?
• What does the term 'slice thickness' refer to in CT imaging?
• What is the term used to describe the dimension of a reconstructed CT slice along the longitudinal direction of acquisition?
• What are the signs of severe contrast allergic reactions?
• What defines the distance between the center of one CT section and the center of the next adjacent section?
• What occurs when an imaging process does not sample all relevant frequencies of a signal?
• What does the term "triple rule-out" refer to in CT examinations?
• At what point does peak hepatic parenchymal enhancement typically occur after contrast injection?
• What is typically assessed by peak atrial enhancement?
• Which of the following enhances image quality in CT imaging?
• Which one of the following contrast agents is typically used in nonionic contrast?
• What artifact occurs when multiple tissues with different linear attenuation coefficients are in the same voxel?
• What term refers to the concentration of a solution measured by the total number of solute particles per kilogram?
• How is the axial plane oriented in relation to the CT gantry?
• What ability is characterized by displaying fine details separately, measured in line pairs per cm?
• Which symptoms indicate moderate contrast allergic reactions?
• What technology is specifically used for cardiac imaging with short exposure times?
• Which of the following examples does NOT belong to HOCM?
• What phenomenon occurs when there is a short circuiting within the x-ray tube, resulting in severe streak artifacts?
• What is the name of the filter applied to raw data during reconstruction to reduce blurring artifacts?
• What type of imaging system has no moving parts?
• What principle is associated with the 1st generation of CT scanners?
• What does the term Views per Rotation (VPR) represent?
• Which type of contrast media is associated with ionic characteristics?
• Which of the following symptoms is NOT associated with mild contrast allergic reactions?
• Which condition describes the presence of excess body fat in the liver?
• Which parameter is critically evaluated in assessing CT image quality in relation to noise levels?
• What is the term for streaking that occurs when part of the patient is positioned outside the SFOV?
• What is the term for the administration of contrast directly into the bladder via catheter?
• What refers to the center point of gantry rotation?
• Which reconstruction method involves multiple passes to achieve final image quality with reduced noise and artifacts?
• What does the term "attenuation" refer to in CT imaging?
• What does "windowing" refer to in CT imaging?
• What term describes the relationship between collimation and the table movement per gantry rotation?
• What does DLP stand for in computed tomography?
• What timeframe is associated with peak atrial enhancement for hepatic contrast?
• What term refers to the reduction of radiation intensity as it passes through a substance?
• What factor controls Pixel Dimension?
• Which of the following elements is crucial for enhancing contrast in a CT scan?
• Which software adjusts kVp based on changing attenuation along the scan range to minimize patient dose?
• Which of the following is a factor that affects spatial resolution in CT scans?
• Which theorem states that a frequency must be sampled at least twice to be reproduced reliably?
• What organs are located in the peritoneal cavity?
• What does minimum intensity projection (min-IP) display in CT imaging?
• What is the term for an x-ray beam that contains photons of many different energies?
• Which type of contrast is less likely to cause an allergic reaction?
• What does the term 'slice sensitivity profile (SSP)' refer to in CT imaging?
• What is the relaxation phase of the heart, also known as the bottom number of blood pressure?
• Which phase of the cardiac cycle represents the heart contracting and exerting force on the atrial walls?
• What kind of artifact could occur due to patient movement during a CT scan?
• What does a ray sum measure in a CT scan?
• What does the beam width dimension describe in CT imaging?
• What term describes the waveform of a signal that represents varied objects imaged in a CT scan?
• What refers to a system's ability to stop motion and produce blur-free images?
• Which method is commonly used to visualize pelvic organs in CT imaging?
• Which reaction is characterized by wheezing and throat tightening?
• Which process involves projecting ray sum data back onto a matrix in iterative reconstruction algorithms?
• In the context of imaging, what does a high window width indicate?
• What is the term for the ability to detect an object with a small difference in attenuation from surrounding tissue?
• What is a voxel of equal length, width, and height called?
• What term refers to the ability of a computer to perform multiple functions simultaneously?
• What term describes a semicomatose state of consciousness, where a person is nearly unresponsive to stimuli?
• What size sections should HRCT acquisitions of the chest be done with?
• What happens during the late arterial phase of renal enhancement?
• What process involves applying radiation dose before and after the acquisition volume in helical CT?
• In CT scanning, orthogonal planes are defined as?
• How are orthogonal reformations positioned in relation to the original plane of data acquisition?
• What is the opacity of voxels in a 3D model adjusted by?
• Which condition is also known as hives?
• What method involves scanning during the diastole phase of the heart cycle?
• What type of 3D modeling utilizes the entire acquired data set but adjusts voxel opacity according to tissue characteristics?
• What does iterative reconstruction primarily aim to reduce in imaging?
• How is Cine CT acquisition defined?
• What device converts an electrical signal into a digital form in a CT imaging system?
• What term refers to the phenomenon where the middle of the image appears darker than the periphery?
• What is the purpose of Automatic Tube Current Modulation (ATCM)?
• What is the purpose of using contrast media in CT imaging?
• What type of imaging modality is CT considered to be?
• What type of filter is used in CT to compensate for a cylindrical shape of the body?
• What is the primary method used to minimize radiation exposure in CT imaging?
• What is the process of displaying CT images in a different orientation from the original reconstruction called?
• What does the term "enteric" refer to in medical terminology?
• Which software adjusts mA during an acquisition to reduce patient dose?
• Which type of scanner uses multidetector technology to scan 4 or more slices per revolution?
• What does Standard Deviation in CT imaging relate to?
• What term describes the condition of intermittent cramping in the legs due to poor circulation?
• What phenomenon describes the increase in average energy of an x-ray beam as it penetrates tissue?
• How is ionization of a volume of air measured?
• Which factor primarily influences the quality of a CT image?
• In CT imaging, which plane is parallel to the plane of the CT gantry?
• What is the temporary rise in blood pressure that may occur during forcible exhalation called?
• What does ALARA stand for in the context of radiation safety protocols?
• Which rendering technique is used in CT to provide a 3D view of structures?
• What term is used for images that have equal section thicknesses and reconstruction intervals?
• What does the term "vacuum phenomenon" refer to?
• What advantage does helical (spiral) CT offer over conventional sequential CT?
• What does a ring artifact in CT imaging indicate?
• What causes a grainy appearance on a CT image due to insufficient x-ray photon flux?
• What component of the CT scan determines the amount of data used in reconstruction?
• What does the linear attenuation coefficient indicate?