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Week 1 Review Don’t forget: You can copy- paste this slide into other presentations, and move or resize the poll.

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Presentation on theme: "Week 1 Review Don’t forget: You can copy- paste this slide into other presentations, and move or resize the poll."— Presentation transcript:

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2 Week 1 Review

3 Don’t forget: You can copy- paste this slide into other presentations, and move or resize the poll.

4

5

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7 Week 2: Radiographic Equipment 6

8 Game Plan Identify generic components of the radiographic equipment Describe various planes of x-ray tube and table movement Discuss contrast and density Exposure Factors 7

9 Generic Components of Radiographic System X-ray Tube Collimator Assembly Radiographic Table Control Console Tube support 8

10 9 Radiographic Room

11 X-ray Tube Housing 10

12 11 X-RAY Tube Housing Lead and steel Absorbs stray radiation Prevents x-ray photons from leaking from tube

13 12 X-RAY Tube Made with Pyrex glass –Withstands HIGH heat loads Gas Evacuated –so electrons won’t collide with the air molecules in the tube

14 13 Early X-RAY Tube

15 14 The X-RAY Tube Lead and steel housing Pyrex glass encased in a housing Primary components ANODE (+) & CATHODE (-)

16 15 X-RAY Tube Most important component of the radiographic system Produces the X-rays

17 16 X-Ray Machine Purpose: –provide a specific current (mA) & voltage (kVp) to the x-ray tube kVp controls the energy of the x-ray photons mA controls the number of x-ray photons –convert electrical energy to electromagnetic energy (x- ray photons)

18 TO PRODUCE X-RAYS YOU NEED A SOURCE OF ELECTRONS A FORCE TO MOVE THEM QUICKLY SOMETHING TO STOP THEM SUDDENLY 17

19 Source of Electrons

20 19 Cathode Filament –Thoriated tungsten Focusing cup (beam focus)

21 20 Process of x-ray production on Cathode side (-) mA (milliamperage) is sent to filament –Via cables Filament heats up –electrons “boil off” (thermionic emission) –focusing cup focuses electron beam toward anode Electrons have negative charge

22 A force to move them quickly. Something to stop them suddenly

23 22 Process of x-ray production on Anode side (+) Positive voltage (kVp) is applied Causes electrons to accelerate towards anode –Laws of attraction Electrons “slam into” target of anode – suddenly stopped. X-RAY PHOTONS ARE CREATED

24 23 High voltage to anode attracts electrons from cathode Current to stator causes rotation of anode

25 24 Anodes - Target Cu W Common target (focal track)material is Tungsten Molybdenum or Graphite base Rotating Anodes 2” to 5” disk (focal track) Rotation speeds Low: 3,000 – 3,600 rpm High: 9,000 – 10,000 rpm

26 25 X-ray Tube Anode  Stator and rotor make up the induction motor  Molybdenum stem connects rotor with anode  reduces heat transfer to rotor and bearings  Focal track area (spreads heat out over larger area than stationary anode configuration)

27 26 Rotating Anode Molybdenum stem and base used because it is a poor heat conductor Tungsten can withstand high heat loads

28 27 How Are X-rays Made? Source of electrons move at high speed (KE) Collide with target or focal track) on anode KE of electrons converted to x rays & heat –99% heat –1% x-ray photons

29 Collimator Knobs 28

30 29 Collimator Attaches directly below the x-ray tube Serves as a beam limiting device Controls size and shape of the x-ray field

31 30

32 31 Collimator Knobs

33 32 Cone collimator

34 33

35 Radiographic Table 34

36 35

37 36 Tables Tilting tables – diagnostic and fluoroscopic work –90 degrees in one direction –15 – 30 degrees in the other direction – ancillary equipment: footboard, shoulder support, handgrips, compression bands

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40 39 http://www.youtube.com/user/ARCOMAME D?blend=1&ob=5#p/a/u/2/C9fTjmQrfj8

41 40 TABLE OR UPRIGHT BUCKY TRAY

42 41 The ‘bucky’ is like a drawer

43 42

44 43 Image Receptors and Bucky tray Intensifying screens Film

45 Image Receptors Cassette Based 1) Film /screen (FS) 2) Computed Radiography (CR) Cassette-less 1)Digital Radiography (DR) Indirect Capture Direct Capture 44

46 Film Screen 45

47 46 Darkroom for Film Screen Image receptors

48 47 What is in the Darkroom?

49 48

50 49 Safe Light 7-15 Watts Red filter Must be 3-6 feet from counter top or feed tray of processor Used to be amber or orange filter

51 50 FILM SCREEN PROCESSOR

52 51

53 CR- PSP plate 52

54 53 CR Reader for Computed Radiography image receptors

55 Multiloader 54

56 Digital Radiography: Direct Capture Amorphous selenium 55

57 Digital Radiography: Indirect Capture Amorphous silicon 56

58 57 The bucky tray can be found: –In the table or chest board Holds the cassettes –CR –Film Screen

59 58

60 59

61 60 Bucky tray

62 61 Bucky Tray Image receptor is held in bucky

63 62 FLUOROSCOPY: Images in motion

64 63 REMOTE ROOM Conventional Room

65 64

66 65

67 66 FLUOROSCOPY must wear shielding while x-ray beam is on Lead apron Lead Curtain

68 Tube Supports Designed to help technologists with various tube locations for creative imaging. Tube suspension systems are available in 5 versions 67

69 68 Floor mounted & Overhead Suspension

70 69 Floor to Wall or Ceiling

71 70 Table Suspension Telescoping Tube

72 71 Tube Movement Longitudinal Transverse Vertical Angling or Rolling Rotating Telescoping

73 CONTROL CONSOLE Gives the technologist control of the xray machine Technique selection Located OUTSIDE of the Radiographic Room 72

74 73 kVp & mAs

75 74

76 75 The Control Console Set technical factors (mAs & kVp) Make an exposure Only a legally licensed individual is authorized to energize the console

77 76 “Technique” kVp, mAs (mA x s) What is set at the control panel How the “image” is created on the “film” or Image receptor (digital) kVp controls the “ENERGY” of the beam The Higher kVp – more penetrating Ranges is 50 -110 in Diagnostic x-ray

78 77 “Technique” kVp, mAs (mA x s) mA- is the current in combination with the time – determines HOW LONG the beam will stay on Controls the density on the film/image

79 78

80 Ancillary Equipment Grids View boxes and viewing computers Darkroom Processors and Readers Misc Equipment 79

81 80 Grids Body parts 10cm & more Lead strips parallel to centerline Absorbs scatter –Improves detail

82 81 Scatter adds a “foggy appearance Makes image more gray

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86 85 Other x-ray equipment Positioning phantoms Pixie

87 86 Other x-ray equipement Positioning sponges Lead markers

88 87 Positioning sponges

89 88

90 89 Lead Shields Gonad shields Lead wrap arounds Lead aprons

91 Lead Gloves and Glasses 90

92 Are x-ray machines prisoner to one room??? 91

93 92 Mobile X-RAY equipment Portables –Take machine to patient –Still images C-arm –Used in interventional procedures –Used in surgery –Dynamic images –Fluoroscopy

94 93 PORTABLE UNITS

95 94 Trauma wrist done portable - using positioning devices Lead apron sponge TAPE

96 95

97 96 When patients cannot go the Radiology Department

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102 101

103 Review

104 103 X-ray Tube Construction G F E D C A B

105 104 X-ray Tube Construction A. Glass housing (envelope) B. Molybdenum neck of the anode C. Stators /Electromagnets D.Tungsten anode (focal spot) E. Window or port for beam exit F. Filament (cathode) G. Focusing cup

106 105 TUBE HOUSING What is it made of?

107 106 Is this rotating or stationary anode?

108 What is required to produce x-rays?

109 108 What is required to produce x-rays? Requirements: –a source of fast moving electrons –sudden stop of the electrons’ motion (KE) –kinetic energy (KE) is converted to EMS energies Heat x-ray photons

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