CT Registry Review Systems/Physics

Continuous rotation scanners made helical imaging possible. Helical imaging is a technique in which the scanner moves continuously in a spiral or helical pattern while acquiring images. This allows for faster and more efficient scanning compared to conventional scanners, which acquire images slice by slice. Helical imaging is particularly useful in applications such as computed tomography (CT) and magnetic resonance imaging (MRI), where rapid image acquisition is desired.

Most CT scanners today use solid-state detectors in which the x-ray photon causes the detector to generate a flash of light. Solid-state detectors are made of semiconductor materials such as silicon or germanium, which can convert x-ray photons into electrical signals. These detectors offer high sensitivity, fast response time, and excellent image quality, making them ideal for use in CT scanners. Additionally, solid-state detectors are more durable and stable compared to other types of detectors, ensuring reliable and accurate imaging results.

The correct answer is mA, which stands for milliamperes. Milliamperes control the number of electrons that flow from the cathode to the anode in a circuit. The operator can alter the milliamperes to adjust the flow of electrons and control the intensity of the current.

Attenuation data must be converted into digital format for the array processor because digital format is the most suitable and efficient format for processing and analyzing data using an array processor. Digital data can be easily manipulated, stored, and transmitted, making it easier to perform complex calculations and operations on the attenuation data. Additionally, digital data provides higher precision and accuracy compared to analog or photon formats, ensuring reliable and accurate results from the array processor.

The detectors measure attenuation data from various projections and this data is contained in the raw data.