In short what spatial resolution refers to is that we cannot compare two different types of images to see that which one is clear or which one is not. The higher the spatial resolution, the greater the capacity for distinguishing fine detail. detail. –Table 6.2 shows the limiting resolution of x-ray based imaging modalities. What is spatial resolution. An average observer is able to view 6 lp/mm with no magnification. definition. the ability of an x-ray system to display adjacent small objects as separate and distinct. line pairs per millimeter. what is spatial resolution measured in. The number of pixels contained in a digital image and the distance between each pixel (known as the sampling interval ) are a function of the accuracy of the digitizing device. sharpness. Place a sharp edge in the image, and measure the resulting edge response. The spatial frequencies utilized range from 175 x 175 pixels (30,625 total pixels) down to 6 x 6 pixels (36 total pixels) to provide a wide latitude of possible resolutions within the frequency domain. The term used to identify this is line pairs per millimeter (lp/mm). To compare the resolution and image quality of standard SE echo-planar imaging DWI with two high-spatial-resolution alternatives, RS echo-planar and AR-SMS imaging, for breast imaging. If we have to compare the two images , to see which one is more clear or which has more spatial resolution , we have to … The total MTF is the product of the MTF of all constituent parts of the imaging system. This weeks topic on digital radiography is spatial resolution. Spatial resolution performance is an intrinsic property of an imaging system that is generally independent of the selected technique factors (kilovoltage and tube current–exposure time product). The 10%-90% distance of this curve is the best single parameter measurement of the system's resolution. –Humans can resolve up to ~30 lp/mm on close inspection. When you measure the spatial resolution of an imaging system, the steps are carried out in reverse. The spatial resolution of a digital image is related to the spatial density of the image and optical resolution of the microscope used to capture the image. This example shows that for contact radiography, the size of the focal spot has negligible effect on the spatial resolution performance. Spatial frequency is related to spatial resolution; to be more specific, higher spatial frequency allows higher spatial resolution. The limiting spatial resolution is essentially the same (i.e., ~3 lp/mm) that was achieved using the small focal spot. Materials and Methods. 8.3 , where an angiographic image is shown using two different spatial resolutions. Spatial resolution is the technical term used to refer to the amount of blur in an image. Spatial frequency, another fundamental concept of radiography, is typically measured in line pairs per millimeter (lp/mm). Spatial resolution is the capacity for distinguishing fine detailin an image. MTF is calculated from the line spread function using Fourier transform analysis. Factors affecting spatial resolution . If the object spatial frequency is too high for the system, the system will be unable to display the image adequately. An example of spatial resolution in medical images is given in Fig. –The limiting spatial resolution is the maximum number of line pairs per millimeter that can be recorded by the imaging system. 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