What is slice thickness in CT?

What is slice thickness in CT?

Slice thickness and slice increment are central concepts that surround CT/MRI imaging. Slice thickness refers to the (often axial) resolution of the scan (2 mm in the illustration). Slice Increment refers to the movement of the table/scanner for scanning the next slice (varying from 1 mm to 4 mm in the illustration).

What determines the slice thickness on the CT scanner?

With single-slice CT, the slice thickness is determined by the detector width – with mild slice broadening just based on the pitch of the helical scan. With MDCT, slices can be composed of a single detector thickness or multiple adjacent detectors.

What is the difference between 64 slice and 128 slice CT?

To reduce the radiation dose, it is important to use different methods with the scanner provided. Compared with 16-slice and 64-slice CT, 128-slice CT has more detectors, which means larger volume coverage and shorter scan times.

What is slice of CT scan?

The term slice refers to the number of rows of detectors in the z-axis of a CT. For example, in an 8-slice CT, there are eight slices of data captured for each rotation of the gantry. The first CT scanners offered single slice CT (SSCT) images but now there are multiple-slice CT scanners (MSCT.)

What is slice in Dicom?

Slice ordering (SO) is set in a protocol for MR scan and the information is saved in DICOM image header. The released software, checkslice reads the slice order direction from a DICOM file, and the MATLAB script provides an idea of how to check SO from EPI data of multiple projects and studies.

Why does the slice thickness vary among examination protocols?

Why does the slice thickness vary among examination protocols? The thinner the slice creates more detail and anatomy you can acquire, but gives the patient greater radiation exposure. If scanning a large body part, it is better to have thicker slices to reduce exposure to the patient.

What determines slice thickness?

MSCT Slice Thickness and X-Ray Beam Collimation In MSCT, however, slice thickness is determined by detector configuration and not x-ray beam collimation. For example, the 4 slices in Figure 2A are each 5 mm thick because they are acquired by 5-mm detectors (formed by linking four 1.25-mm detector elements).

Does slice thickness affect CT number?

The study concluded that the lowest slice thickness increased the CT image details and structures despite the higher noise [13].

What is 320 Slice heart Scan?

The 320 Slice CT Scan system is an advanced imaging system that scans your body from head to toe, in less than one minute. It helps to accurately identify any abnormality. The system uses X Rays to obtain cross-sectional images or “slices “of the targeted area.

How many detectors are in a 128 slice CT?

One detector (A) covers the entire scan FOV (50 cm), while the other detector (B) is restricted to a smaller, central FOV (33 cm) due to space limitations on the gantry (Fig. 2). Each detector contains 64 detector rows, each of which is 0.6 mm wide.

What is pixel spacing Dicom?

In the DICOM standard, Imager Pixel Spacing is defined as: Physical distance measured at the front plane of the detector housing between the center of each image pixel specified by a numeric pair – row spacing value(delimiter) column spacing value in mm.

What is instance number in Dicom?

Instance Number. 1. A number that identifies this Waveform. Waveform Identification Module Attributes. (0020,0013)