INTRODUCTION Radiographic viewing box is an illuminator use in viewing radiographs. Proper viewing conditions are very important when interpreting a radiograph. The viewing condition can enhance or degrade the subtle detail of the radiograph14. Before beginning the evaluation of radiograph, the viewing equipment and area should be considered. The area should be clean and free of distracting materials, magnifying aids, and film makers should be close at hand. Its function being to improves subject contrast of a radiographic image by enhancing the visualization of radiographs without which a radiographic image even with a good objectives contrast may not be well interpreted due to difference in perception of radiographic contrast by different observers9. X-ray illuminators have found increasing use in recent years as a tool for diagnosing medical problem.
Since the discovery of x-ray in 1895 by William roentgen in Germany, many x-ray equipment and accessories have evolved, all aiming at proper radiation protection and adequate diagnosis of illnesses. Among these inventions are the x-ray illuminators, which play an important role in film viewing, perception and interpretation of visible images.
TABLE OF CONTENTS Title page Dedication Acknowledgement Table of contents
CHAPTER ONE Background of study Introduction Statement of problem Purpose of study Significance of study Scope of study Review of related literature
CHAPTER TWO Theoretical background 2.1 Viewing conditions Observer and visual acuity Those relating to the illuminator 2.2 Features of illuminator boxes 2.3 How to carry quality control test for illuminator Direct assessment of surface perspex screen of illuminator Assessment of the surface perspex screen of illuminator using black card. 2.4 Care of illuminators 2.5 Materials use in construction of illuminator box Plastic Metals 2.6 Electrical components A rechargeable battery A switch Electrical wire A choke Transformer
CHAPTER THREE Materials and methods 3.1 Preliminary steps 3.2 Choice of design 3.3 Fabrication of the illuminator housing The head: Components and systems required: 3.4 Machinery used in this contruction 3.5 Sources of materials Other materials required and reasons 3.6 Fabrication procedure Plate marking and cutting Folding of plate Welding Drilling Filling Painting Fabrication of the perspex screen. Materials used in the production of the screen Procedure 3.7 Voltage regulator circuit Circuit operation The stand and base
CHAPTER FOUR 4.1 Research findings/ quality control tests 4.1.1 Uniformity of the intensity of illuminator Determination of the uniformity of the intensity of ilumination. Procedures: 4.1.2 Measuring the temperature of the surface over a period of time. Quality control test for maximum discharging time Summary of results Recommendation from the study Area of further studies Limitations of study Conclusion References
LOCAL CONSTRUCTION OF BATTERY POWERED DUAL FACE RADIOGRAPHIC VIEWING BOX WITH ROTATABLE NECK AND ADJUSTABLE STAND
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