. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent; designed for the use of practitioners and students . ^ •- -o 1) c rt ?: -T S. S> S! cI ^ •- g S O S G. ^ i: a. jj T3 c ■*. aj OJ ■n f; c» 0 -^ t ■B 1) n ^ ^^ no V Tf a; OJ C rt 3 .Aj (Tj nj ri *^ ^ o <-. a. o 2 a^ ^ ^ a; o rt ei: u o ^ &r- ^ o 1* „ -^ ;^ c t: o tS .2 P METHODS OF EXAMINATION 6l equivalent so far as the X-rays are concerned to suspension in stretcher should be 51 centimetres (20 inches) wide only and 183centimetres (6 feet) long, and should be supported about 4 feet
. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent; designed for the use of practitioners and students . ^ •- -o 1) c rt ?: -T S. S> S! cI ^ •- g S O S G. ^ i: a. jj T3 c ■*. aj OJ ■n f; c» 0 -^ t ■B 1) n ^ ^^ no V Tf a; OJ C rt 3 .Aj (Tj nj ri *^ ^ o <-. a. o 2 a^ ^ ^ a; o rt ei: u o ^ &r- ^ o 1* „ -^ ;^ c t: o tS .2 P METHODS OF EXAMINATION 6l equivalent so far as the X-rays are concerned to suspension in stretcher should be 51 centimetres (20 inches) wide only and 183centimetres (6 feet) long, and should be supported about 4 feet abovethe floor (see Fig. 49 ). A low chair or other convenient step to. 62 THE ROENTGEN RAYS IN MEDICINE AND SURGERY enable the patient to get on to the stretcher easily should be at height and horizontal position of the stretcher facilitate the workof examination, and if it is desired to examine the patient from theside, or when lying on his face or back, he can readily turn on thestretcher. The stretcher forms an equally convenient support duringeither screen or photographic examination. Relative Position of Patient, Tube, and Screen or Plate. — It is to beremembered that the X-ray picture on the screen or photographic plateis of the nature of a shadow such as that cast by an opaque substanceon a flat surface by candlelight. The following considerations must,therefore, be regarded in X-ray work: First, the shadow will alwaysbe somewhat larger than the object if the tube is not properly placed,but the enlargement will diminish as the distance between object andscreen diminishes, and as that betw^een object and tube increases. Ifthe tube is 90
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