Biomedical subjects

Y Ariji

Publications and source records attributed to Y Ariji.

26 records · Page 2Linked to original sources

PubMed1996

Computed tomographic indices for maxillary sinus size in comparison with the sinus volume.

OBJECTIVES: To ascertain the normal range of maxillary sinus size and its changes with age on computed tomography (CT) and define convenient indices for sinus size, in addition, to examine the association of the height of the sinus floor with age and status of the dentition. METHODS: The transverse and anteroposterior dimensions of the normal maxillary sinuses in 107 subjects were measured on axial CT and the relationship between these values and the sinus volume analysed. The height of the sinus floor was obtained by measuring the vertical distance from the anterior nasal spine to the sinus floor. RESULTS: The mean transverse and anteroposterior widths of the normal adult maxillary sinuses were 2.70 (s.d., 0.60) cm and 3.56 (s.d., 0.47) cm, respectively. There was a close correlation with sinus volume which could be predicted well from the multiple regression formula. These values increased up to the age of 20 y, but then decreased. There was no significant difference between subjects aged 50-79 years with and without maxillary premolars and molars. The width of the adult sinus correlated with the interzygomatic buttress distance and body weight. The mean height of the adult maxillary sinus floor was 0.37 (s.d., 0.44) cm inferior to the anterior nasal spine. It correlated negatively with sinus volume and fell with age up to 20 y, then rose again. In adults, it was not significantly influenced by the dentition status, and rose in proportion to the decrease in the interzygomatic buttress distance, and body height and weight. CONCLUSION: The transverse and anteroposterior widths of the maxillary sinus on axial CT are convenient indices for its size. The height of the sinus floor altered with changes in sinus volume, but was not directly influenced by the status of the dentition.

Adolescent↗

PubMed1996

Texture analysis of sonographic features of the parotid gland in Sjögren's syndrome.

OBJECTIVE: The purpose of this study was to develop a method for quantitative analysis of the sonographic features of parotid glands as a noninvasive tool for the diagnosis of Sjögren's syndrome. SUBJECTS AND METHODS: Sonographic texture analyses were performed on the parotid glands of 44 patients with Sjögren's syndrome, 83 healthy volunteers, and 17 patients with chronic parotitis, using a fast Fourier transform program. RESULTS: Texture analysis of sonographic studies of the parotid gland using a Fourier transform showed that the sum of the normalized radial power spectrum in the low-spatial-frequency region (S value) of the parotid gland was significantly higher (p < .0001) in the patients with definite Sjögren's syndrome [6.70 +/- 2.13 (x10(5))] than in the 72 age-matched normal volunteers [3.25 +/- 1.08 (x10(5))]. However, patients with probable Sjögren's syndrome showed S values [3.92 +/- 1.88 (x10(5))] similar to those of the controls. On the other hand, SDs of the echo levels in the parotid gland showed significantly greater (p < .0001) values in patients with definite (4.63 1.07) and probable (4.53 1.47) Sjögren's syndrome than in the normal controls (3.30 0.76). Discriminant analysis showed that a combination of these two distinctive values increased diagnostic accuracy to 96.9%. Furthermore, S values and SDs correlated well with the qualitative grading of sonographic features and with the gradings of sialography. CONCLUSION: The system we describe for texture analysis of sonographic images is useful in the diagnosis of Sjögren's syndrome.

Adult↗

PubMed1994

Florid cemento-osseous dysplasia. Radiographic study with special emphasis on computed tomography.

This article describes the computed tomographic and conventional radiographic findings for florid cemento-osseous dysplasia. A low-density thin layer or cystlike area was observed around the high-density masses in the tooth-bearing area in the seven cases studied. Expansion of the buccal and lingual cortical plates was observed in association with cystlike areas, but was infrequently observed in florid cemento-osseous dysplasia not having such areas. The computed tomographic number of the high-density masses ranged from 772 to 1587 Hounsfield Units and was equivalent to that of cementum or cortical bone.

Adult↗

PubMed1994

Ultrasonographic evaluation of inflammatory changes in the masseter muscle.

The ultrasonographic images of 32 patients with inflammatory change in the masseteric region were investigated to clarify the characteristic findings and to evaluate the utility of ultrasonography. Inflamed masseter muscles frequently demonstrated reduction of echo intensity and complete or partial absence of hyperechoic bands. The mean thickness of the masseter muscle on the unaffected side was 8.6 mm, whereas that on the affected side was 12.9 mm. Nine of 10 patients with heterogeneous hypoechoic area, but only 1 of 10 patients with homogeneous hypoechoic area, had received surgical treatment before ultrasonographic examination.

Abscess↗

PubMed1994

Studies on the quantitative computed tomography of normal parotid and submandibular salivary glands.

A better understanding of computed tomographic (CT) numbers of normal salivary glands might help make CT diagnosis more accurate. The CT numbers of the parotid and submandibular salivary glands were measured using both non-enhanced and enhanced CT images by setting a circular region of interest (ROI). The normal range of CT numbers, the difference between the CT numbers of right and left glands, and the correlation with age were all investigated. There was a close correlation between the CT numbers of right and left glands. No significant difference was seen between the average of right and left CT numbers in both glands, on either non-enhanced or enhanced CT images. The difference between right and left numbers on enhanced CT were larger than those on non-enhanced CT. A significant difference was seen between the CT numbers of the parotid and submandibular glands. A sex difference was seen on both non-enhanced and enhanced CT images in the parotid gland, while it was only seen on enhanced CT in the submandibular gland. The range as well as the mean of CT numbers in all cases of enhanced CT were larger than those of non-enhanced CT. CT numbers of the parotid glands tended to decrease proportionally with age, up to the age of 40 years; over the age of 40, no relationship could be detected. In the submandibular gland, the difference in the correlation coefficient was not significant between the two age groups. Further investigation into the factors affecting the CT numbers of normal glands is required before they can be used for diagnostic purposes.

Adolescent↗

PubMed1994

Increased attenuation in odontogenic keratocysts with computed tomography: a new finding.

An increased attenuation area (IAA) is sometimes seen in the cystic cavity of odontogenic keratocysts (OKCs) on CT scans. The significance of IAA was compared radiologically and histologically in 26 cysts in which a provisional diagnosis of OKC had been made. First, the presence of IAA in the cystic cavity was assessed. Then, relationship between the presence of IAA and data obtained from the cysts, including the CT and histological findings and the visual appearance of the cyst contents, was evaluated. An IAA was frequently seen in large multilocular cysts. There was no relationship between the presence of IAA and aggressive features of the cyst on CT or the cyst contents. Histologically, subepithelial inflammation was often observed in the cysts with IAA. In order to ascertain whether the IAA was due to the keratin mass, a CT scan of a bundle of hair in a water bath was performed and shown to have a similar density. Our study demonstrated that IAA in cystic cavities results from desquamated keratin. Since this seems to occur in long-standing or inflamed multilocular OKCs, it could be used as a significant finding in the diagnosis of OKC.

Adolescent↗

PubMed1994

Age changes in the volume of the human maxillary sinus: a study using computed tomography.

An understanding of the age-related changes in the volume of the normal maxillary sinus will help to identify sinus abnormalities. Normal maxillary sinus volume was measured on axial CT scans in 115 cases, and analysed in relation to age, the presence of premolar and molar teeth, size of the midfacial skeleton and body height and weight. The volume ranged from 4.56-35.21 cm3 (mean: 14.71 +/- s.d. 6.33 cm3) in patients aged over 20 years. There was no significant sex difference and a close correlation between the two sides was found. The volume increased up to the age of 20 years, but then decreased. There was no significant difference in patients with and without maxillary premolars and molars between the ages of 50 and 79 years. The difference in right and left dentitions had no influence on the maxillary sinus volume over the age of 20 years. Adult maxillary sinus volume correlated with the interzygomatic buttress distance. In adult females, there was a significant correlation between the volume and the zygomatic-occipital distance. In adult males, the volume correlated with body height and weight. It appears that volume changes with age might be related to skeletal size and physique.

Adolescent↗

PubMed1993

Multimodality imaging of cervicofacial actinomycosis.

Actinomycosis is an uncommon chronic disease usually caused by Actinomyces israelii. It affects the soft tissue mainly but sometimes spreads to involve salivary glands, bone, or even the skin of the face and neck. Five cases have been seen in our department. Several imaging modalities were used to assist in making the diagnosis. The cases are presented and the literature reviewed. Ultrasonography was found to be a useful diagnostic tool especially in developing the differential diagnosis.

Actinomycosis↗