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Unit VI Special Imaging Systems Chapter 39 Mobile Radiography.

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Presentation on theme: "Unit VI Special Imaging Systems Chapter 39 Mobile Radiography."— Presentation transcript:

1

2 Unit VI Special Imaging Systems

3 Chapter 39 Mobile Radiography

4 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.4 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

5 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.5 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

6 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.6 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

7 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.7 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)

8 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.8 Objectives Determine appropriate grids for mobile examinations Appraise various film/screen combinations for mobile application

9 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.9 Special Patient Considerations Communication Manipulating equipment Positioning and pathology

10 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.10 Communication Park mobile unit outside patients room –Establish rapport –Get patients permission to do the exam –Explain the procedure –Move items that will be in the way Incognizant patients Surgery/Emergency Room/ICU

11 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.11 Manipulating Equipment Watch out for: –Equipment power supplies –Oxygen tubing –Intravenous lines –Catheters, etc.

12 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.12 Manipulating Equipment Dont bump the bed or your head Radiographers responsibility to return all items to their original locations

13 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.13 Positioning and Pathology Maintain typical positioning for examinations Perform chest radiography in semi-erect position whenever possible

14 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.14 Positioning and Pathology Increased possibility of artifacts –Remove all radiopaque objects –Move lines from imaging field if possible Limit coverings to single, smoothed layer

15 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.15 Demonstration of Air-Fluid Levels

16 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.16 Demonstration of Air-Fluid Levels

17 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.17 Types of Equipment Power supplies Generators Power drive

18 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.18 Power Supplies Portable light duty units –220V or 110V outlet Full power mobile institutional units –Capacitor discharge –Battery operated

19 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.19 Generators Capacitor discharge –Constant potential output Battery operated –3 phase output

20 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.20 Power Drive Self-propulsion for mobile unit Dead-man switch Must use caution when piloting equipment

21 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.21 Special Technical Factor Selection Considerations Kilovoltage Milliampere-seconds Distance Grids Film/screen combinations Other factors

22 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.22 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

23 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.23 Distance Must be measured accurately

24 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.24 Grids

25 Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED.25 Film/Screen Combinations Wide latitude image receptor appropriate


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