What does the data acquisition system do in CT?
Data Acquisition System-DAS-measures the photons that pass through the patient and strike the detectors. They convert the analog signal from the detector into a digital signal. They are positioned near the detectors.
What are the modes of CT data acquisition?
2.2 Scan-Acquisition Modes. There are two basic scan modes in CT, axial (sequential) scanning and helical (spiral) scanning. Building on these are specialized modes of scanning for perfusion, fluoroscopy, cardiac, and dual-energy imaging.
What is acquisition in CT scan?
Context 1. CT image acquisition, the tube runs through a circular (or helical) trajectory around the patient body emitting x-rays in a collimated fan beam “slicing” the patient body transversally. A set of projections is obtained when data are acquired by the set of detectors at different source locations ( Fig. 1) …
What are the major components used for data acquisition in CT?
-The major components used for data acquisition are the scanning gantry, x-ray generator, and patient table.
What is image reconstruction in CT?
Image reconstruction in CT is a mathematical process that generates tomographic images from X-ray projection data acquired at many different angles around the patient. Image reconstruction has fundamental impacts on image quality and therefore on radiation dose.
What is CT data?
The term “computed tomography”, or CT, refers to a computerized x-ray imaging procedure in which a narrow beam of x-rays is aimed at a patient and quickly rotated around the body, producing signals that are processed by the machine’s computer to generate cross-sectional images—or “slices”—of the body.
What is helical CT?
Listen to pronunciation. (HEE-lih-kul kum-PYOO-ted toh-MAH-gruh-fee) A procedure that uses a computer linked to an x-ray machine to make a series of detailed pictures of areas inside the body. The x-ray machine scans the body in a spiral path.
Is MRI more detailed than CT?
A CT scan uses X-rays, whereas an MRI scan uses strong magnetic fields and radio waves. CT scans are more common and less expensive, but MRI scans produce more detailed images.
What are components of CT?
CT scanners are composed of three important elements: an X-ray tube, a gantry with a ring of X-ray sensitive detectors, and a computer. In this method, images are created using the same physics principles as in conventional radiography.
What is the reconstruction method used in CT?
The most commonly used analytical reconstruction methods on commercial CT scanners are all in the form of filtered backprojection (FBP), which uses a 1D filter on the projection data before backprojecting (2D or 3D) the data onto the image space.
What is data acquisition module?
Data Acquisition Modules (8) 24-Bit Analog Inputs for Thermocouple, RTD, Thermistor and Semiconductor Sensor Probes (2) Integrated Cold Junction Compensation (CJC) Sensors An Independent Alarm for Each Input (8) User-Configurable Digital I/Os Configured for Input or Output
What is CT equipment?
Computed tomography (CT) is a type of imaging. It uses special x-ray equipment to make cross-sectional pictures of your body. During a CT scan, you lie still on a table. The table slowly passes through the center of a large X-ray machine.
What is computer acquisition?
Acquisition: Acquisition is the process of collecting digital evidence from an electronic media. There are four methods for acquiring data: disk-to-disk copy, disk-to-image file, logical disk-to-disk file, and sparse data copy of a file or folder. Only well-preserved evidence can be presented for court proceedings.