[Study on the growth of orbital volume in individuals at different ages by computed tomography].

OBJECTIVE: To study the growth aspects of orbital volume and to establish the normal value of orbital volume by computed tomography (CT). METHODS: One hundred and twenty three individuals without eye diseases (64 males, 59 females) were divided into 5 groups according to the age. Orbital volume and length of horizontal transverse axis and anterior-posterior axis of the eye were measured at different levels in original or reconstructive CT images. The relationship between orbital volume and age, gender and eyeball volume was analyzed. RESULTS: There was no difference between the left and right orbital volume in all age groups. Orbital volume grew rapidly before 20 years of old. Mean orbital volume in males aged 17 and females aged 13 was 23.54 and 21.75 ml, respectively, which reached 95% of the adult orbital volume. In normal adult, orbital volume in the male was larger than that of the female. The mean orbital volume of adult male and female was (25.04 +/- 2.37) ml and (22.89 +/- 2.67) ml, respectively. A strong linear correlation was presented between the age and orbital volume (P < 0.05). The difference of orbital volume between the male and female was statistically non-significant before 14 years old (P = 0.315). The growth of eyeball volume was consistent with that of the orbital volume, the ratio of eyeball/orbit volume was decreased with age from 0.40 to 0.26. CONCLUSIONS: There is no difference between the right and left orbital volume. Orbital volume is correlated with age and gender. Orbital volume grows rapidly before 20 years of old and still grows slowly after 40 years old.

[Research and implementation of picture archiving and communication system (PACS) based on B/S mode].

In this paper, with B/S application and architecture, an integrated solution of PACS is designed, and the function and application of each part of PACS based on the architecture is introduced. The PACS based on this mode is safe, stable, easy to manage and upgrade and convenient for use in telemedicine.

[Measurement of ostium area of maxillary sinus on three-dimensional imaging].

OBJECTIVE: To measure the ostium area of normal maxillary sinus and maxillary sinus with inflammation on virtual endoscopy. METHODS: After scanning on coronal or axial position, data were transferred to workstation. Such anatomic structures as ostiomeatal complex (OMC) were viewed by virtual endoscopy (VE). Under the same condition, pixel/mm was worked out. RESULTS: Turbinates, meati and ostiomeatal complex were clearly viewed by virtual endoscopy(VE). The area of normal maxillary ostium was (16.45 +/- 1.21) mm2; the area of abnormal ostium was (18.28 +/- 2.12) mm2. The outside area of ethmoid infundibulum was (15.07 +/- 0.78) mm2 with normal maxillary sinus, and (17.19 +/- 1.59) mm2 maxillary sinus with inflamed. CONCLUSIONS: The areas of mormal and inflamed maxillary sinuses are equal, the outside areas of ethmoid infundibulum are unequal for normal maxillary sinus and maxillary sinus with inflammation.