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We have used an inexpensive 3D printer mounting an inexpensive pre-irradiatedsilicon diode to measure the 2D dose distribution of a small (approximately10mm FWHM) proton beam. z was measured with high resolution whereas x waschanged on a 2mm grid for a total of 12 scans and 2 repeats in 20 minutes. Thepeak dose to the diode was approximately 530 cGy/s, and no degradation in diodesensitivity was observed. We present beam profiles and a 2D beam contourderived from these data.  Most of the scan time was spent changing x by hand, and a more appropriate 3Dprinter along with an improved setup and printer control software would reducethat to about 1 minute for an end-to-end absolute 2D dose measurement. Wepropose extending this to 3D (2D transverse plus depth) for appropriate smallbeams by adding a small water tank.

Using a 3D printer for 2D beam profile measurements in proton radiotherapy