FREE Computed Tomography Ultimate Questions and Answers
Which factor can contribute to the occurrence of ring artifacts in CT images?
Ring artifacts can occur due to irregularities or malfunctions in the CT detector elements, resulting in variations in image intensity.
What is the purpose of a CT collimator?
The CT collimator shapes the X-ray beam to match the desired scanning area and reduce unnecessary radiation exposure to surrounding tissues.
Which artifact occurs when an object is positioned partially in and partially out of the scan field of view?
Partial volume artifacts occur when an object spans multiple voxels and contains different materials, leading to inaccuracies in density representation.
What is the purpose of CT dose modulation techniques?
CT dose modulation techniques adjust the radiation output based on the patient's size and anatomy, optimizing the radiation exposure while maintaining diagnostic image quality.
Which parameter is adjusted by the kilovoltage (kV) setting in CT scanning?
The kilovoltage (kV) setting in CT scanning determines the energy of the X-ray beam, which influences radiation dose and image contrast.
What is the purpose of using a convolution kernel in CT image reconstruction?
A convolution kernel is used in CT image reconstruction to apply filtering that improves image quality, sharpness, and noise characteristics.
Which term refers to the ability of a CT scanner to acquire images in a very short time interval?
Temporal resolution refers to the ability of a CT scanner to capture images in a short time interval, essential for imaging moving structures such as the heart.
Which type of CT scan involves acquiring images at multiple time points to visualize the distribution of contrast agent in tissues?
Dynamic CT involves acquiring images at multiple time points to observe the distribution of contrast agent in tissues over time, often used in perfusion studies.
What is the primary purpose of CT fluoroscopy?
CT fluoroscopy allows real-time visualization of needle placement and other interventional procedures, improving accuracy and safety.
What is the purpose of the CT couch indexing feature?
The couch indexing feature allows controlled movement of the patient through the gantry during scanning, ensuring complete coverage of the region of interest.
Which type of CT scan is often used for imaging larger areas of the body with minimal patient movement?
Helical CT allows continuous scanning while the patient moves through the gantry, making it suitable for imaging larger body areas with minimal patient movement.
What does the term "window width" refer to in CT image analysis?
Window width refers to adjusting the display contrast in CT images to visualize a specific range of Hounsfield units and enhance tissue differentiation.
Which parameter determines the amount of radiation exposure delivered to the patient during a CT scan?
The milliampere-seconds setting controls the amount of radiation exposure delivered during a CT scan, influencing image quality and patient dose.
Which term describes the ability of a CT scanner to accurately represent small objects or structures in the images?
Spatial resolution is the ability of a CT scanner to accurately represent small objects or structures, determining the clarity and level of detail in the images.
What is the purpose of a CT scout image (localizer) in patient positioning?
A CT scout image (localizer) is used to define the specific area of the patient's body that will be imaged during the CT scan, ensuring accurate positioning.
What is the primary advantage of using a higher tube voltage (kV) in CT imaging?
Higher tube voltage (kV) can lead to improved spatial resolution in CT imaging, allowing better differentiation of small structures.