41. Its imaging capability is based on a Fourier-transform technique using a set of 9 rotational modulation collimators . 42. The collimator consists of a thick sheet of lead, typically thick, with thousands of adjacent holes through it. 43. The purpose of the collimator and re-imaging optics are to take the best possible image of the slit. 44. In the isolated direction the beam is split, and then diverged, so it does not focus at the collimator . 45. Fresnel lenses of different focal lengths ( one collimator , and one collector ) are used in commercial and DIY projection. 46. New systems involving multileaf collimators ( MLCs ) are used to further shape a beam to localise treatment fields in radiotherapy. 47. The secondary collimator consists of two jaws which can be moved to either enlarge or minimize the size of the treatment field. 48. Aimpoints, like all other collimated sight systems, induce some parallax at different ranges due to the nature of the collimator . 49. The OSLO software is used by scientists and engineers to design reflectors, optical instruments, laser collimators , and illumination systems. 50. SAS 3 carried modulation collimators ( 2-11 keV ) and Slat and Tube collimators ( 1 up to 60keV ).
