Use Of Resolution Phantoms And A Mobile Phone Imaging System

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Aims Two imaging systems have been tested, including an advanced X-ray imaging system that utilizes geometric magnification and a mobile phone imaging system. The aim of this experiment is to use resolution phantoms to determine system parameters including resolution, effective pixel sizes, magnification and other geometric parameters. Results X-ray Imaging Image set Mag. Spot size (hxw;um) Effective Px Size (um) Actual Mag. Source/Sample Distance (m) Vertical resolution Horizontal resolution 1 High 20 x 20 16.4 11.8 0.25 25 25 2 High 40 x 20 50 25 3 Low 20 x 20 25.5 7.61 0.39 25 25 4 Low 40 x 20 50 50 Mobile phone imaging Phone/Camera model: IPhone 5s Native pixel size: 1.5 um Image Sample/Camera Distance (cm) Magnification Effective Px Size (um) Resolution 1 30 0.013 112.9 0.8 2 7 0.05 30 0.312 3 14 0.03 50 0.156 Images: Figure 1-Focused photo from distance of 30cm Figure 2-Autofocus image from distance of 7cm above Figure 3-Photo with water drop distance from 14cm above Discussion X-ray imaging True resolution or we can say as optical resolution, in theory, the resolution will be dependent on the diffraction limit of the imaging system and this diffraction limit is dependent on the numerical aperture, the other way to describe it is the smallest object that we can see from the image. Sensor resolution, in theory, the effective pixel size sets a lower limit on the smallest structure that can be resolved and the smallest resolvable feature scale

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