Radiographic Film Dosimetry

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Emulsion of Fiilm/Radiograph The heart of a film is emulsion whichh contains grains (crystals of silver hhalides) lid ) in gelatin l i Gelatin is suitable due to � it keeps grains well dispersed � it prevents clumping and sedimentatioon of grains �� it protects the unexposed grains from reduction by a developer � it allows easy processing of exposed grains � it is neutral to the grains in terms of fogging, loss of sensitivity Electron micrograph of grain in gelatin ID/ARS/09
Unusual Grain Morpho ologies of <strong>Film</strong>s Eastman Kodak Company, 2001 Cheng & Das, Med. Phys. 23, 1225, 1996 ID/AAPM- SS-<strong>Film</strong>/09
Page 1 and 2: Radiographic Indra J. J Das, , Ph h
Page 3 and 4: Historical Pe erspective 1826 Josep
Page 5: Photographhic Process �� Sil Si
Page 9 and 10: Gurney & Mott Theory of Latent Imag
Page 11 and 12: Opti cal Dens sity 1.6 1.4 1.2 1.0
Page 13 and 14: Optical Density D (OOD) 3.0 2.5 20
Page 15 and 16: Hurter & Drriffield (1890) OD= log
Page 17 and 18: Sensit tometric c (a) (c) () (c) Va
Page 19 and 20: Contras st 7.0 6.0 5.0 4.0 3.0 2.0
Page 21 and 22: Densitometerrs/ Digitizers � Visu
Page 23 and 24: Optimum Film Properties � Linear
Page 25 and 26: Dose rattio 110 1.10 1.08 1.06 1.04
Page 27 and 28: Op ptical De ensity 50 5.0 4.0 3.0
Page 29 and 30: Effect of film misalign nment on de
Page 31 and 32: Methods to eliminaate problems with
Page 33 and 34: OD vs Dose = a+b(OD) +c PDD = [a+b(
Page 35 and 36: 30 25 20 15 10 5 0 0 0.2 0.4 Sykes
Page 37 and 38: Rel lative Do ose (%) 100 80 60 40
Page 39 and 40: Relat tive dose (ratio) ( Film Film
Page 41 and 42: 200 180 160 140 120 100 80 60 40 20
Page 43 and 44: Net Optical Density D 3.0 2.5 2.0 2
Page 45 and 46: e w e w (e (ew) n P Perpendicular e
Page 47 and 48: IMRT Verification ID/AAPM- SS-Film/
Page 49 and 50: Film Dosimeetry - Caution �� St
Page 51 and 52: Summmary �� Film is ideal detec

Radiographic Film Dosimetry

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