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Understanding the locks of the Mobile Image Intensifier C-arm

2. Learning Outcomes. Introduction to Radiographic Equipment ? Concept mappingIdentify Equipment PartsLocate Equipment LocksDescribe the Associated Movements of the LocksDiscuss Applications of Associated MovementsStudent Self Assessment. 3. Student Self Assessment. Students may be advised to:

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Understanding the locks of the Mobile Image Intensifier C-arm

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    1. 1 Understanding the locks of the Mobile Image Intensifier “C-arm” For Medical Radiation Technology Students by Catherine Baerg, Khysar Pasha and Lance Wall

    2. 2 Learning Outcomes Introduction to Radiographic Equipment – Concept mapping Identify Equipment Parts Locate Equipment Locks Describe the Associated Movements of the Locks Discuss Applications of Associated Movements Student Self Assessment

    3. 3 Student Self Assessment Students may be advised to: Review this presentation Hot Potatoes Quiz Practice moving Mobile C-arm in clinical

    4. 4 Mobile Radiographic Equipment Types Various types available as shown on concept map. Present focus Mobile Fluoroscopic C-arm

    5. 5 Mobile fluoroscopic C-arm Recall Fluoroscopy is a dynamic radiographic examination. Why mobile fluoroscopy? For surgical procedures

    6. 6 Mobile fluoroscopic C-arm They operate in same manner as stationary units. The designation of "C-arm" comes from the physical arrangement of the unit. C-arm consists of the image intensifier at one end, and the X-ray tube at the other end.

    7. C-arm Equipment Parts 7

    8. 8

    9. 9 Rotational Lock Releasing this lock allows movement from vertical to horizontal position and angles in between.

    10. Horizontal position 10

    11. 11 Flip Lock During some procedures it may be necessary for the image intensifier to be located on the bottom side of the C-arm. Releasing the Flip lock will enable the intensifier to be positioned on the bottom.

    12. Intensifier has been flipped to the bottom position. 12

    13. 13 In/Out Lock Releasing this lock extends or retracts the C-arm 6”. This allows a range of motion over anatomy while the base of the C-arm remains in place.

    14. 14 In/Out Lock This picture shows the horizontal arm of the C-arm in full extension compared to the previous picture of complete retraction.

    15. In/Out lock is circled

    16. 16 Pivot or “Wig-Wag” Lock Releasing this lock enables the intensifier to move along the long axis of anatomy without moving the base of the C-arm.

    17. 17 Pivot or “Wig-Wag” Lock This photo and the previous one show the range of pivot of the C-arm.

    18. 18 Dual articulation of locks In some instances the C-arm must be placed over the anatomy rather than under the anatomy.

    19. These two button pairs raise and lower the height of the intensifier. The C-arm must be plugged in for these buttons to activate. These buttons are not considered locks but they can alter the position of the machine.

    20. 20 Applications of C-arm In surgical procedures. (eg. closed reduction of fractures, placement of pacemaker leads, hip pinning procedures) The following slides will show examples of procedures where the C-arm is used.

    21. Closed Reduction 21

    22. Abdominal Fluoroscopy Note clear plastic sterile cover over image intensifier. 22

    23. Hickman catheter placement Patient and C-arm in position for a Hickman catheter placement. Introduction of the catheter begins in the upper thorax and is completed with the catheter in the heart. 23

    24.  C-arm placed in “rainbow” position for cervical procedures. 24

    25. C-arm over anatomy The rainbow position is used especially for larger patients in which the table or size of the patient would not allow enough elevation of the C-arm to include the lumbar spine. 25

    26. C-arm under anatomy 26

    27. C-arm at 90° to anatomy (vertical position) 27

    28. Hip Pinning-- Antero-Posterior (AP) Position Two projections are always required. Each must be at 90° to the other. This position of the intensifier shows the Antero-posterior (AP) position. 28

    29. Hip Pinning– Lateral Position The C-arm is rotated to the horizontal or lateral position to visualize the patient’s fractured hip in the lateral position. The orthopedic surgeon will know if the fracture is reduced by viewing these two projections. 29

    30. 30 Summary Understanding the locking system is very important. Why?

    31. Summary cont’d Because of the situations where the C-arm is used. The operating room is a stressful environment. You are working within a sterile field. 31

    32. Self Assessment Try the quiz to test your knowledge! 32

    33. Resources Carlton & Adler: Principles of Radiographic Imaging, An Art and a Science, 3rd Edition Frank: Merrill's Atlas of Radiographic Positioning and Radiologic Procedures, 11th Edition Online Course Radiographic Equipment Course, SIAST Medical Diagnostics 33

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