. The American journal of roentgenology, radium therapy and nuclear medicine . ifting the tube until the hori-zontal plate of the frontal bone casts but asingle shadow. The head, which has beenexamined in the lateral position, is now ro-tated back again through an arc of 180 de-grees until it lies in a lateral position, areversal of the former, and finally back tothe original position with the face , it will be seen, the cranium has beencovered twice in the examination with a con-seqeunt reduction of the chance of error. Accessory Sinuses.—Having completedthe general survey, the f
. The American journal of roentgenology, radium therapy and nuclear medicine . ifting the tube until the hori-zontal plate of the frontal bone casts but asingle shadow. The head, which has beenexamined in the lateral position, is now ro-tated back again through an arc of 180 de-grees until it lies in a lateral position, areversal of the former, and finally back tothe original position with the face , it will be seen, the cranium has beencovered twice in the examination with a con-seqeunt reduction of the chance of error. Accessory Sinuses.—Having completedthe general survey, the frontal sinuses andanterior ethmoids are examined in the an-terior-posterior position. The operatorsright hand is now placed beneath the occiput Fig. 2. Position for the Examination ofTHE Accessory Sinuses and OccipitalRegion (Waters and Waldron). Waters. This gives essentially the same pro-jection as the radiographic method, althoughthe relative position of the tube and headare reversed. Fluid (pus or blood) or foreign bodies inthe antrum or sinuses are easilv Fig. 2a. Diagram of Fluoroscopic ImageObtained by the Position Illus-trated IN Fig. 2. F—Frontal Sinus,O—Orl)it, A—Antrum, M—Mastoid. Occasionally the overlapping of the shadowsof the opposite sides gives the appearance ofa foreign body. However, if the head is ro-tated the density of the suspected shadow Fluoroscopic Examination in Injuries to the Head 139 will diminish at some point during the rota-tion. On the other hand, a foreign body willalways show the same density without rela-tion to the position from which it is within the sinus, the shadow of the for-eign bodA- will always show within its out- it, if it is intra-ocular. A foreign body lo-tained. In this position, the cornea can occa-sionally be seen and any foreign body lo-cated in reference to it. The patient is di-rected to look up and then down when theshadow of the foreign body will move with
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