<a href="https://en.wikipedia.org/wiki/Coded_aperture" class="extiw" title="w:Coded aperture">Coded aperture mask</a> for <a href="https://en.wikipedia.org/wiki/Gamma_camera" class="extiw" title="w:Gamma camera">gamma camera</a> (for <a href="https://en.wikipedia.org/wiki/SPECT" class="extiw" title="w:SPECT">SPECT</a>)
none (contains no original authorship)
self-made (Scanned on Epson Perfection 1270)