. The American journal of roentgenology, radium therapy and nuclear medicine . he very stout, and occa-sionally for the lateral exposures. Muchwork is done with a back-up spark of onlythree and a half inches. A difference of aninch or even half an inch in potential asmeasured on the parallel gap may deter-mine the worth or worthlessness of a plate. Technique of Roentgen Examination of the Spine I must confess to the very unscientificpractice of never looking at my milH-amperemeter. As a matter of fact withthe rheostat setting employed, and with aback-up spark of four and a half inches,it regis
. The American journal of roentgenology, radium therapy and nuclear medicine . he very stout, and occa-sionally for the lateral exposures. Muchwork is done with a back-up spark of onlythree and a half inches. A difference of aninch or even half an inch in potential asmeasured on the parallel gap may deter-mine the worth or worthlessness of a plate. Technique of Roentgen Examination of the Spine I must confess to the very unscientificpractice of never looking at my milH-amperemeter. As a matter of fact withthe rheostat setting employed, and with aback-up spark of four and a half inches,it registers about twenty-two milliam-peres. I must confess also that I guess at thetime of my exposures which is doubtless only necessary for the purpose of eliminat-ing the blurring effects of motion, and istherefore not a prime requisite in theroentgenography of most of the question naturally arises as to thedanger of bums with the technique I haveoutlined. As to this I can state that I haveheard indirectly of one instance where amild erythema developed in one of my. Fig 14. Tuberculosis of Eighth Dorsal withAbscess Formation, Ixdicated by the FusiformShadow Seen Through that of the Heart. Without careful obser\ation such a shadow mightunder certain circumstances be mistaken for ananeurysm. Fig. 15. Incomplete Spina Bifida of Eleventhand Twelfth Dorsal. This possibility must always be kept in mindespecially in children. a very bad habit. I give what I feel to beenough and let it go at that. As a matterof fact, merely for the purpose of em-bodying the figures in these notes, I foundupon investigation that in making a singleanteroposterior plate of the lumbar spinein a patient of medium size, I was givingan exposure of about sixteen seconds. Inlateral views I give at least twice as Hickey at the meeting a year ago inChicago when questioned as to the tech-nique employed in his beautiful spinework, advised taking plenty of time inmaking the exposure. I can heartily
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