Table 1.

Overview of the beam parameters used by different groups

Author	Location	Beam energy (MeV)	Collimator material/thickness	Slit/channel width (µm)	Spacing (µm)	Approx. dose rate (Gy/min)
Prezado et al. (2013)	Orsay	105 1 GeV	Brass/ 5 cm & magnetic lead/ 70 cm & magnetic	700 700	1400, 2800, 3500 1400, 2800, 3500	–
Dollinger et al. (2013)	Munich	20	PBS	10–50	500	40–100
Girst et al. (2015)	Munich	20	PBS	260–520	1800	40–100
Dilmanian et al. (2015)	MD Anderson	109	Tungsten/ 5 cm	300	1000	90
Peucelle et al. (2015)	Orsay	100	Brass/ 5 cm	400 700	3200 3500	2
Lee et al. (2016), Meyer et al. (2017)	Seattle	50.5	Steel/ 2.5 cm	300	1000	10–20
Guardiola et al. (2017)	Orsay	100	Brass, tungsten, nickel, iron	400	3200	6
Prezado et al. (2017)	Orsay	100	Brass/5 cm	400 (1100 in rat)	3200	2
Mossahebi et al. (2017)	Maryland	80–140	Tungsten/5 cm	300	1000	90
de Marzi et al. (2018)	Orsay	123 150	PBS	400 (1100 in rat)	1000	6

PBS, pencil beam scanning;