1. Then, the low dose effects and roentgenography interval were discussed.

2. Methods Esophagography and double - contrast roentgenography were performed in 15 patients with infraluminal esophageal carcinoma.

3. Fusion rate, segmental lordosis , and disc height were assessed by roentgenography.

4. Computer assisted analysis of bone mineral density (BMD) from common X ray films is a new technique combining digital image processing with roentgenography.

5. Objective To evaluate the dental - facial symmetry in normal Shanghai adults occlusion with posterioanterior cephalometric roentgenography.