A convolution kernel is used in CT image reconstruction to apply filtering that improves image quality, sharpness, and noise characteristics.
The CT collimator shapes the X-ray beam to match the desired scanning area and reduce unnecessary radiation exposure to surrounding tissues.
CT fluoroscopy allows real-time visualization of needle placement and other interventional procedures, improving accuracy and safety.
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.
Ring artifacts can occur due to irregularities or malfunctions in the CT detector elements, resulting in variations in image intensity.
The kilovoltage (kV) setting in CT scanning determines the energy of the X-ray beam, which influences radiation dose and image contrast.
Helical CT allows continuous scanning while the patient moves through the gantry, making it suitable for imaging larger body areas with minimal patient movement.
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.
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.
Window width refers to adjusting the display contrast in CT images to visualize a specific range of Hounsfield units and enhance tissue differentiation.
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.
The couch indexing feature allows controlled movement of the patient through the gantry during scanning, ensuring complete coverage of the region of interest.
Partial volume artifacts occur when an object spans multiple voxels and contains different materials, leading to inaccuracies in density representation.
Higher tube voltage (kV) can lead to improved spatial resolution in CT imaging, allowing better differentiation of small structures.
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.
The milliampere-seconds setting controls the amount of radiation exposure delivered during a CT scan, influencing image quality and patient dose.
