Japanese Journal of Radiological Technology

A device was made to which a frame with which 2 pictures could be taken serially were attached. One of the good points is that an assistant is able to change x-ray films in 2.5 seconds, and so is never exposed to radiation. Morever, we would like to emphasize that this device was made rather inexpensively, utillizing an old bed, acrylic acid resin and so on.

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General speaking, the angle of patient inclination and x-ray tube rotation in the radiography would be determined by mean of anatomic and statistic method, standard positioning angle would be found. In practice we used to add experimentally little correct to standard angle for each patient. However it is always necessary that radiographer endeavor to increase ability of reappearance of radiographic positioning, for this purpose we must find primary factor to position patient and center x-tube. For example, in Stenvers position (for partes petrosa) and Mayer position (for partes petrosa) the inclinationol angle of latitude direction of head depends on the angle between long axis of part petrosa and median plane, accordingly in this case necessary primary factor for us is this angle. We hare studied about method to know inclinational angle before Stenvers position, Mayer position and other radiography for ear which request the exact angle between part petrosa and median plane.

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There are many radiographies as routine work about which we have not fully studied by reason that it is rerative easy. Water position (for nase) is one of such a group. However if we knew perfectly true purpose of Water pasition, we could not make it light. The dignotic objects of radiograph by Water position are maxillary Sinus and Frontal sinus, and other supero anterior sinuses. In postero anterior projection, maxillary sinus over lap on the partes petrosa which has large x-ray absorption, this thing makes particular inclination of Water position for longitude direction of head necessary in radiography of maxillary sinus, on the other oner inclination brings image of maxillary sinus and part petrosa to o elaping imoge. We recognized true mean of Water position and secked suitable inclinational angle in Water position about Japanese.

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Development of films in a roller type automatic processor depends chiefly upon the temperature of developer, pressure of a roller, site of vomitory of a circulating pump, fatigue of fllter, and flow rate of replenisher. So these factors were studied by examining density curve of films using an aluminium step penetrameter. 1) Similar density curves were obtained by CDM-101R developer at the temperature of 26.5℃ for 1.5 minute in a roller type and by CDRX developer at 20℃ for 2 min. 40 sec. in a hanger type processor. Nevertheless, higher shadow density and lower γ, that is flatter tone of film, were often revealed in the former. 2) Coincidence of density curves was observed in the following two cases, a roller was operated for 90 seconds in developer of an automatic processor, and ordinary 140 seconds development in a tank processor. This shows the fact that pressure for a roller promote development equally. 3) Agitation power was decidedly diminished by a solution roller rack, but, development of the part of film around vomitory was apparently increased, so "toe" or "shoulder" in density ourve were noted. 4) A developmental filter revealed about 1 gr adherence after dealing 300 sheets of film in the size of 10×12 inches. Namely, no remarkable changes occur in density curve of films after development of 12,000 sheets of the same film. 5) Flow rate of replenisher must be smaller in the case of relative more percentage of films sized under 10×12 inches. 6) Avoidance from higher shadow density and flattening of film which in apt to be taken place in high temperature developing could be obtained by suitable combination of developer and film.

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