Table of Contents
What is spatial resolution in PET?
The spatial resolution of the PET images is typically ~4-5 mm, and the CT images is ~ 1 mm. This combined PET/CT scanner is a powerful tool for assessing functional and anatomical information in a single fused image for research in non-human primates.
What determines spatial resolution in PET?
The “fundamental” effects that limit the spatial resolution in PET cameras are the detector width, the positron range, and the acollinearity.
What do you mean by spatial resolution?
Spatial resolution is a measure of the smallest object that can be resolved by the sensor, or the ground area imaged for the instantaneous field of view (IFOV) of the sensor, or the linear dimension on the ground represented by each pixel.
What are the main factors affecting the resolution of PET images?
The major factors that can affect the spatial resolution of PET images include size of the detector used; colinearity, or most precisely, noncolinearity of annihilating photons; and range of emitted positrons.
What is the best spatial resolution?
The finest resolution as of now is 30cm provided by very high-resolution commercial satellites.
- – Low resolution: over 60m/pixel.
- – Medium resolution: 10 ‒ 30m/pixel.
- – High to very high resolution: 30cm ‒ 5m/pixel.
What is spatial resolution in CT?
Spatial resolution in CT is the ability to distinguish between object or structures that differ in density. A high spatial resolution is important for one to discriminate between structures that are located within a small proximity to each other.
What is spatial resolution image?
In terms of digital images, spatial resolution refers to the number of pixels utilized in construction of the image. Images having higher spatial resolution are composed with a greater number of pixels than those of lower spatial resolution.
How is spatial resolution defined quizlet?
spatial resolution. degree of geometric sharpness or accuracy of the structural lines recorded in the image. ability of imaging system to accurately display objects in 2 dimensions.
What is an example of spatial resolution?
Spatial resolution refers to the size of one pixel on the ground. For example 15 meters means that one pixel on the image corresponds to a square of 15 by 15 meters on the ground. This is also sometimes referred to as Ground Sample Distance (GSD).
How is spatial resolution expressed?
Spatial resolution is expressed in line pairs per mm (lp mm). The absence of spatial resolution in an image may be referred to as blur. When optimized, screen film systems have excellent spatial resolution, whereas electronic detectors are limited by pixel size.
What is contrast and spatial resolution?
A has a low contrast resolution. B has a high contrast resolution. Spatial Resolution. Spatial resolution in radiology refers to the ability of an imaging system to differentiate between two nearby objects. In digital imaging, it depends on the size of the pixel used.
What is spatial resolution of an image?
What is spatial resolution quizlet?
What does poor spatial resolution mean?
Although EEG provides good temporal resolution of millisecond or less, it does not provide good spatial resolution. There are two main reasons for the poor spatial resolution: the blurring effects of the head volume conductor and poor signal-to-noise ratio.
What affects spatial resolution?
The factors affecting the spatial resolution of absorption and phase contrast were studied. The location of the sample, the period of 2D grating, the area duty cycle of the 2D grating, and the width of harmonics in the spatial harmonic method play vital roles in determining the spatial resolution.
What is spatial resolution in PET systems?
Spatial resolution is an important metric for performance characterization in PET systems.
What is the best way to characterize the image resolution of pet?
As recommended by the NEMA standards for both clinical and small animal PET systems (NEMA 2008, 2012), the standard way to characterize the image resolution of a PET system is through point source measurements at different locations.
How is spatial resolution measured?
Spatial resolution is measured by reconstructing point source scans using the filtered backprojection (FBP) algorithm and calculating the FWHM from the profiles along the radial and tangential directions. As the FBP algorithm is linear, the measured spatial resolution is independent of any activity distribution in the background.
How does sampling error affect spatial resolution?
The final effect that degrades spatial resolution is the sampling error. The fundamental measurement in PET is the number of coincident events recorded by a detector-detector pair, known as a chord or a line of response (LOR).