Computed Tomography (CT) Image Production Post-Course Assessment Practice Test

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• Which component controls the physical size of the x-ray beam in a CT system?
• What is the purpose of using a scout or localizer image in CT?
• In a CT scan, what is the pitch value when the table moves a greater distance than the width of the beam?
• Pitch is an acquisition variable defined specifically for which acquisition mode?
• What is typically done to improve the quality of CT images in terms of uniformity?
• What computed tomography (CT) pixel intensities become white when using a 400 window width and 30 window level?
• Failure to obtain which type of consent can lead to a Health Insurance Portability and Accountability Act (HIPAA) violation?
• How does the selection of reconstruction algorithms affect CT imaging?
• When the display field-of-view (DFOV) is increased, what is the effect on pixel size?
• Which of the following factors does NOT contribute to decreased spatial resolution when increasing the pitch?
• Contrast resolution is defined as the ability to:
• What are three potential benefits of increasing the CT acquisition thickness from 1 mm to 2 mm?
• Which acquisition thickness results in the highest spatial resolution?
• What combination of variables results in the most detailed CT images?
• A region-of-interest (ROI) indicating an average Hounsfield unit (HU) of -697 mostly likely corresponds to which of the following?
• A technologist reviews a patient's electronic medical record (EMR) for evidence of a gadolinium allergy prior to performing a scan with contrast. Is this a Health Insurance Portability and Accountability Act (HIPAA) violation?
• What is the streaking in an image primarily a result of?
• What data process is used to smooth or sharpen image data for better visualization of the desired anatomy?
• What QC test creates a graph of attenuation coefficients alongside the CT number during the scan?
• What is the goal of iterative reconstruction techniques in CT?
• What is a main disadvantage of using thick detector rows in computed tomography?
• Which CT scanning method allows for continuous movement of the patient table during data acquisition?
• What are common types of artifacts seen in CT imaging?
• In the context of a CT scan, what does the term "contrast agent" refer to?
• How does dual-energy CT work?
• In what way does increased detector sensitivity affect CT imaging?
• What is a common use for CT in emergency medicine?
• Which of the following can lead to out-of-field artifacts?
• What type of field does the computed tomography (CT) system save the patient's anatomy as raw data?
• When comparing a pitch of 1 to a pitch of 1.2, what differences can be expected? (Select two)
• What is another term commonly used for raw data in CT imaging?
• Why is it important to minimize motion during a CT scan?
• What is the main advantage of multi-slice CT (MSCT) over single-slice CT?
• Which parameter relates to the amount of radiation exposure in CT imaging?
• Which factor is directly affected by a higher pitch during computed tomography scans?
• Which algorithm should be prioritized for imaging soft tissue injuries effectively?
• After scanning a very large patient, how can a radiologist request new images with decreased image noise?
• What is a significant limitation of CT imaging?
• Which factor is primarily affected when increasing matrix size in CT imaging?
• For optimal tissue visualization in CT, what is essential regarding the windowing technique?
• Changing the slice thickness of a coronal reformation affects the dimensions of the image data in which axis?
• Why might a patient be asked to hold their breath during a CT scan?
• What is the function of the collimator in a CT scanner?
• Which CT artifact is caused by a significant increase in the average energy of the x-ray beam?
• Which procedural change will enhance spatial resolution in a CT image?
• Compared to a pitch of 1, what changes are observed with a pitch of 1.137? (Select three)
• How can patient radiation exposure be reduced during CT imaging?
• What two types of reconstruction algorithms should be used to view bony injuries to the thorax? (Select two)
• What is the primary concern regarding radiation exposure from CT scans?
• How does tube current (mA) affect CT scans?
• What is the benefits of using multi-slice CT technology?
• If a technologist arranges for coworkers to sign a "Get Well Soon" card for a scheduled liver biopsy, does this violate HIPAA?
• Which of the following techniques is best suited for examining the blood vessels in 3D?
• What will happen if the window level is increased while keeping the window width constant?
• What is a key difference between axial and helical CT scanning?
• Which acquisition configuration is best suited for high-resolution images in a helical mode CT scan?
• Which advantage does CT imaging provide over traditional x-ray imaging?
• What happens to pixel size when the display field-of-view is decreased?
• What is the thinnest detector row configuration possible on a 32-slice computed tomography (CT) scanner?
• What is the primary purpose of the detector array in computed tomography (CT)?
• Changing the slice thickness of a sagittal reformation affects the dimensions of the image data in which axis?
• What kind of software is commonly used by CT technologists?
• What technology allows for real-time imaging during a CT scan?
• What is meant by "4D CT" imaging?
• Which reconstruction protocol will produce the highest image noise in computed tomography?
• What happens to scan data if the acquisition thickness exceeds the pitch?
• When trabecular bone appears blurry in CT imaging, which quality control issue is likely responsible?
• Which imaging technique is primarily non-invasive?
• What effect does a large matrix have on CT imaging quality?
• Which window settings are optimal for visualizing the bones of the cranium in a CT scan?
• What effect does increasing the rotation time have on image noise in computed tomography (CT) scans?
• Which type of imaging is most effective for evaluating soft tissue?
• Which scanning method is also known as sequential scanning?
• Which principle is primarily responsible for the creation of CT images?
• What can lead to a failed detector element in CT imaging?
• Which two statements correctly describe data acquisition in helical scanning?
• What is likely causing a blurry appearance in the coronal reformation of the abdomen?
• Which two variable changes are expected to improve contrast resolution of CT scans?
• What machine parameter is critical for optimizing CT image quality?
• What is a key factor in reducing the risk of radiation exposure during CT scans?
• What process is responsible for converting helical attenuation data into axial sections?
• What may result in a ring artifact on a CT image?
• How is radiation dose measured during a CT exam?
• What is one advantage of using a small reconstruction slice thickness?
• What data acquisition technique produces a three-dimensional volume of anatomical data?
• Which components are basic to a CT imaging system?
• Compared to a soft tissue algorithm, a bone algorithm will have more: (Select two)
• The contrast resolution of a CT system is recorded in which units?
• Which axis position has changed when evaluating a series of coronal images?
• How can motion artifacts be minimized when scanning a patient's chest?
• What Common feature do we typically observe in images reconstructed with advanced algorithms compared to simpler ones?
• If the window width is 300 and the window level is decreased from 30 to 0, what effect will this have on the image?
• What condition can lead to ring artifacts in a CT scan?
• In which situation would you prefer using helical scanning over axial scanning?
• What benefits does CT angiography provide over traditional angiography?
• How do artifacts affect CT images?
• Motion artifact in a CT image can be attributed to which two factors?
• What type of CT has a higher radiation dose, diagnostic or therapeutic?
• With a pitch of 1, acquisition thickness of 1.5 mm, and other defined variables, what statement describes the resulting scan data?
• When the pitch of a CT scan is greater than 1, what does it indicate about the table movement?
• Why is patient hydration important before a CT scan with contrast?
• What is the risk associated with texting patient information using non-secure messaging apps?
• Centering the patient improperly on the CT gantry can lead to which type of artifact?
• What adjustment can enhance the detail of small structures in a CT image?
• What is the impact of using a bone algorithm on image noise compared to a standard algorithm?
• What does the voxel represent in CT imaging?
• Which reconstruction algorithm would result in the most image noise assuming all other factors remain constant?
• What will the pitch be if the table moves equal distance to the width of the beam in spiral acquisition mode?
• What is a benefit of using thicker slices in CT imaging?
• Which windowing option will produce the longest scale of contrast for a CT image of the abdomen?
• How does decreasing the window width affect the contrast of a CT image?
• Which of the following reduces the accuracy of imaging characteristics in CT?
• What are the main factors influencing the quality of a CT image?
• Which component of a computed tomography (CT) system is responsible for measuring and converting transmitted radiation?
• A single picture element in a computed tomography (CT) image is called what?
• What does a wide x-ray beam primarily affect in CT imaging?
• What technique improves imaging of structures with low contrast between them?
• A radiography department uses a shared computer for electronic medical record (EMR) access that does not require a passcode for sign-in. Is this a violation of Health Insurance Portability and Accountability Act (HIPAA) law?
• When spatial resolution is increased, what is the expected outcome in the CT image?
• Which condition may cause beam hardening in CT imaging?
• Which factor increases the risk of cone beam artifact?
• In CT imaging, what is the main purpose of using a bone algorithm?
• What computed tomography (CT) data acquisition mode describes a specific scanning method?
• What role does patient history play before a CT scan?
• What post-processing procedure is indicated by the term 'Region-of-interest (ROI)'?
• What scanning mode is appropriate for imaging the entire Circle of Willis in one x-ray exposure?
• How would increasing the rotation time affect spatial resolution?
• What aspect of CT imaging improves the segmentation of tumors?
• Which scanner has the highest spatial resolution based on Hounsfield units and line pairs?
• What CT number will be displayed for a voxel that contains portions of lung, air, and a contrast-filled artery in a minimum intensity projection?
• Which image is displayed with a window width of 2500 and a window level of 600?
• Which component of a CT system is primarily responsible for data acquisition?
• How can excessively high contrast in a CT image be improved?
• What imaging technique can be used to create a sagittal image series with 5 mm slices after completing a chest scan?
• When creating a multiplanar reformation, which parameters must be set by the technologist?
• A region-of-interest (ROI) placed on the parotid abnormality in this image produced a Hounsfield unit (HU) reading of -48. This abnormality is most likely a:
• Half-scan algorithms primarily improve which aspect of image quality in CT imaging?
• If the phantom contains only water, which issue might need to be reported based on ROI readings?
• If the pitch of a scan is calculated to be greater than one, what is the result?
• Which algorithm is expected to yield 3D images with the least amount of image noise?
• What do window level and window width control in CT imaging?
• Metal artifacts on a CT image are categorized as which type of artifact?
• What type of artifact can be minimized by administering glucagon during CT abdomen imaging?
• What factors contribute to the development of radiation-induced carcinogenesis from CT imaging?
• Which scenario constitutes a violation of federal health information law?
• What role does patient history play in CT image interpretation?
• What does the CT number, or Hounsfield unit, indicate?
• An orthopedic surgeon needs to review 3D images of a femur fracture. Which rendering technique offers a 3D view without processing the entire dataset?
• What type of imaging technique does a CT scan primarily use?
• What is the effect of using a pitch of less than one on temporal bones CT imaging?
• What is a requirement for a successful retrospective reconstruction of CT images?
• Which aspect of image quality can be improved by using electrocardiogram (EKG) gating?
• After performing a thoracic spine scan for trauma, the radiologist requests images to include the entire lumbar spine. This will require:
• How is image contrast enhanced in CT scans?
• What defines a voxel in a computed tomography (CT) image?
• What rendering technique is used to create an axial reformation?
• How does CT imaging assist in the diagnosis of cancer?
• What is a common cause of streaking artifacts in CT imaging from significant x-ray absorption?
• What does "pitch" refer to in helical CT scanning?
• What is the function of the CT reconstructed image process?
• What is the role of the x-ray tube within a CT scanner?
• When can beam hardening artifacts occur in CT imaging?
• Which of the following matrix sizes will have the smallest pixels?
• In CT imaging, what does a higher Hounsfield unit typically indicate?
• What artifact results from using thick axial slices in CT imaging?
• Which two imaging planes would allow for measuring the dimensions of a pathology in the Y-axis?
• What is a common intravenous iodine-based contrast agent used in CT?
• Which feature of a CT image represents the thickness of the slice being reconstructed?
• What is the significance of scout films in CT imaging?
• What does "slice thickness" refer to in CT imaging?
• What is the cause of the streaking around the patient's right shoulder in a CT image?
• What is the effect of doubling the beam width while maintaining the same pitch?
• What is the primary benefit of customizing patient dosing in CT imaging?
• Aliasing artifact is associated with which of the following causes?
• What is the effect of increasing the slice thickness in a CT image?
• What is the role of a technologist during the CT scanning process?
• What is the role of automatic exposure control (AEC) in CT imaging?
• How can CT simulation improve treatment planning?
• Which detector configuration provides the most total beam coverage?
• What happens to the pitch during helical scanning if the table moves a distance shorter than the width of the beam?
• Which QC test ensures that CT numbers increase proportionally with increasing physical density?
• Which parameter describes the number of bits used for each pixel in a CT image?
• In which component does the reconstruction of raw data into image data take place in a CT system?
• Why is it important to frequently calibrate CT machines?
• What does the term "post-processing" refer to in CT imaging?
• What does a higher window width in CT imaging generally lead to in terms of contrast?
• What is the primary purpose of using multiplanar reformation (MPR) in CT imaging?
• What is a significant disadvantage of using thinner slices in CT imaging?
• Which scan option will yield the best temporal resolution?
• What difference in image processing accounts for the visible difference between the following two images of the brain?
• What is the primary purpose of a computed tomography (CT) scan?
• What is the impact of high pitch settings on imaging quality in CT scans?
• What type of artifact is produced by patient motion during a CT scan?
• How does CT scanning differ from traditional x-ray imaging?
• What is the artifact visible in the posterior portion of the patient's abdomen?
• Which variable changes in a set of coronal images when altering image attributes?
• How does the CT scanner achieve axial and helical data acquisition?
• What is the primary role of a CT radiologist?
• What is the importance of patient positioning in CT imaging?
• The quality of a CT image can be improved by adjusting which two factors?
• Which error causes partial volume averaging in CT imaging?
• What is the role of output devices in a computed tomography (CT) imaging system?
• Which body section is best demonstrated with a window width (WW) of 2500 and window level (WL) of 600?
• What characteristic of the CT scanner may limit the visibility of a small fracture line?
• Which artifact is primarily caused by patient motion during the scan?
• What does the term "matrix size" in computed tomography (CT) refer to?
• Which three detector configurations have the same total beam coverage?
• What is a common artifact caused by foreign bodies in CT images?
• Increasing the slice thickness during CT image acquisition primarily affects which aspect of the image?
• To measure a pathology in the x-axis, which imaging planes could be utilized?
• What is an essential step when interpreting CT images?
• What may result in less detail in a sagittal reformation of the cervical spine?
• What three functions does information within the display field-of-view (DFOV) support?
• Which artifact is commonly associated with missing projections in a CT scan?
• What is the effect of increasing slice thickness on spatial resolution in CT imaging?
• In a voxel that includes various tissue types, what will be displayed by the pixel in the reconstructed image?
• What is the typical range of kVp settings used in CT imaging?
• What safety precautions should be taken regarding contrast agents?
• What is the primary benefit of using volume scanning in CT imaging?
• What causes the large semi-circle overlaying the liver in a CT image?
• Which statement is true regarding helical scanning?
• What principle of physics underlies CT imaging?
• What distinguishes helical CT from conventional CT?
• Which computed tomography (CT) scanning technique allows data collection while the patient table is moving?
• What causes bright areas on the edges of a CT image?
• What protocols are essential for ensuring patient safety during CT scans?
• Compared to a 2 mm reconstruction slice thickness, a 1 mm slice thickness will result in which of the following?
• What is the term for artifacts from incomplete data acquisition due to the failure of detector elements?