Objective To evaluate the subject's absorbed dose,equivalent dose and effective dose.Methods The CBCT unit was Implagraphy and three scan projections were selected such as mandible,maxilla and temporamandibular joint (TMJ).Thermoluminescent dosimeter tubes were used to record the absorbed dose at special positions in the head and neck region of an adult skull and tissue-equivalent phantom.16 interested organs included pituitary,lens,parotid glands,submandibular glands,sublingual glands、diploe,spongy bone of the chin and cervical vertebra,skins of cheeks and nuchal region,thyroid and esophagus.The absorbed dose was measured in these organs,and then the effective dose(E1990,E2007)were calculated according to different ICRP tissue weighting factors.Results The absorbed dose of mandible,maxilla and TMJ scan varied from (0.99 ±0.09) to (12.85 ±0.09)mGy,(0.93 ±0.01) to (13.07 ±0.02) mGy and (0.68 ±0.01) to (10.18 ± 0.04)mGy.There was significant difference among the three scan projections (F =19.61-30992.27,p ＜ 0.05).The equivalent doses of lens and skin were (1.11± 0.07)-(5.76 ± 0.06) mSv and (6.96 ± 0.06)-(10.64 ± 0.07) mSv.There was significant difference among the three scan projections(F =4473.02,9385.50,P ＜0.05).The effective dose(E1990,E2oo7) was [(191.35±1.53),(325.17 ±2.58) μSv] for mandible scan,[(106.62 ±2.17),(226.28 ±2.81)μSv] for maxilla scan,[(104.21 ± 1.02),(142.36 ± 1.90) μSv]for TMJ scan,respectively.Conclusions The valid measurement should be taken to reduce the subject' s dose such as a careful history and clinical examination before the performance of CBCT,the latest risk/benefit assessment,precise scan position,the shielding of thyroid as well as brain and the smaller volume size as well.

Objective:To establish the quality standard system of Gui Erbai gel based on a method ofa system to multiple evalu-ation and discuss the feasibility of the method used for the quality standard for traditional Chinese medicine. Methods:TLC identifi-cation of Gui Erbai gel was established by one thin layer system. An HPLC method was used to detect 6 active components in Gui Erbai gel. Results:Five active components in the gel could be identified by one thin layers system simultaneously with clear spots and good separation. Six active components in the gel could be determined by the same HPLC system with high accuracy. The average content of podophylotoxin,quercetin,kaempferol,imperatorin,dictamnine and rutin is as follows 0. 154,0. 052,0. 138,0. 051,0. 060,0. 048 mg· g-1 . RSD<3％. Conclusion:The established method based on a system to multiple evaluation can be used for the quality standard establishment for Gui Erbai gel with the properties of promising feasibility, simple operation, low cost, high accuracy and good stabili-ty.

Objective To assess the value of cone-beam computed tomography (CBCT) in evaluating the response of unresectable liver cancer to transarterial chemoembolization (TACE). Methods A total of 55 unresectable liver cancer patients with 90 lesions who received TACE at the First People’s Hospital of Liangshan Yi Autonomous Prefecture between July 2021 and July 2023 were enrolled in the study. The response to TACE was evaluated using the modified Response Evaluation Criteria in Solid Tumors one month post-treatment. The value of lesion diameter, volume, and density on CBCT images in predicting the response to TACE was assessed using the area under the receiver operating characteristic curve. Results Of the 55 patients treated with TACE, 26 achieved complete response, 17 achieved partial response, 9 showed stable disease, and 3 had progressive disease. Of the 90 lesions, 48 achieved complete response, 20 achieved partial response, 17 showed stable disease, and 5 had progressive disease. On CBCT images, the mean diameter, volume, and density of lesions with complete and non-complete responses were (20.9 ± 9.9) mm, (1719.3 ± 777.9) mm³, and (143.7 ± 87.9) HU, versus (10.9 ± 7.7) mm, (890.0 ± 327.4) mm³, and (38.8 ± 33.3) HU, respectively, with significant differences between the two groups (t=10.6, 79.8, and 65.5; all P < 0.01). One month post-treatment, CT scans displayed no enhanced areas in lesions with complete response and visible enhanced areas in lesions with non-complete response, with mean lesion diameter and density of (14.1 ± 6.2) mm and (78.8 ± 30.3) HU, respectively. In addition, the areas under the receiver operating characteristic curves of lesion diameter, volume, and density on CBCT images were 0.935, 0.955, and 0.981, respectively, in distinguishing between complete and non-complete responses following TACE. Using a cut-off value of 82.5 HU for predicting response to TACE, the lesion density had sensitivity, specificity, positive predictive value, and negative predictive value of 95.5%, 100.0%, 100.0%, and 95.0%, respectively. Conclusion CBCT is effective in predicting the short-term response of liver cancer to TACE.