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Unit VI
Special Imaging Systems
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Chapter 39
Mobile Radiography
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Objectives
• Identify factors contributing to the difficulty of mobile radiography
• Explain appropriate communications methods for mobile examinations
• Describe items that must be considered when arranging a patient room for a mobile examination
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Objectives
• Recommend methods for accomplishing acceptable variations of standard radiographic projections, especially chest examinations for air-fluid levels
• Assess the radiation protection rules for mobile radiography
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Objectives
• Differentiate light duty portable x-ray units for mobile radiography
• Evaluate advantages of capacitor discharge and battery powered mobile units
• Explain why technical factor selection is more difficult during mobile radiography
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Objectives
• Describe effect of various generator waveforms on kVp
• Identify advantages of standardizing mobile SID to one of 40” (100 cm), 56” (140 cm) or 72” (180 cm)
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Objectives
• Determine appropriate grids for mobile examinations
• Appraise various film/screen combinations for mobile application
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Special Patient Considerations
• Communication
• Manipulating equipment
• Positioning and pathology
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Communication
• Park mobile unit outside patient’s room– Establish rapport– Get patient’s permission to do the exam– Explain the procedure– Move items that will be in the way
• Incognizant patients
• Surgery/Emergency Room/ICU
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Manipulating Equipment
• Watch out for:– Equipment power supplies– Oxygen tubing– Intravenous lines– Catheters, etc.
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Manipulating Equipment
• Don’t bump the bed or your head
• Radiographer’s responsibility to return all items to their original locations
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Positioning and Pathology
• Maintain typical positioning for examinations
• Perform chest radiography in semi-erect position whenever possible
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Positioning and Pathology
• Increased possibility of artifacts– Remove all radiopaque objects– Move lines from imaging field if possible
• Limit coverings to single, smoothed layer
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Demonstration of Air-Fluid Levels
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Demonstration of Air-Fluid Levels
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Types of Equipment
• Power supplies
• Generators
• Power drive
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Power Supplies
• Portable light duty units– 220V or 110V outlet
• Full power mobile institutional units– Capacitor discharge– Battery operated
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Generators
• Capacitor discharge– Constant potential
output
• Battery operated – 3 phase output
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Power Drive
• Self-propulsion for mobile unit
• Dead-man switch
• Must use caution when piloting equipment
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Special Technical Factor Selection Considerations
• Kilovoltage
• Milliampere-seconds
• Distance
• Grids
• Film/screen combinations
• Other factors
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Milliampere-Seconds
• Low power units not capable of high mAs techniques needed for grid radiography
• Double or triple exposure– Be careful not to overload tube
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Distance
• Must be measured accurately
• 40”• 56”• 72”
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Grids
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Film/Screen Combinations
• Wide latitude image receptor appropriate