1.Comparison of Computerized Tomography(CT) and Ultrasonography(US) in the Diagnosis of Nasal Bone Fracture and Medial Orbital Wall Fracture.
Hee Jung LEE ; Young Cheon NA ; Seog Keun YOO
Journal of the Korean Cleft Palate-Craniofacial Association 2002;3(1):55-59
For the diagnosis of nasal bone fracture and medial orbital wall fracture, plain radiography and computerized tomography(CT) have been utilized. But plain radiography is less reliable due to its low specificity. So CT has been given a preference to plain radiography in examining both fractures. However, CT has some disadventages; high expense, heavy radiation hazard, and coexistent injuries may restricted a patient,s positioning and so thus preventing or delaying the diagnosis. By comparison, ultrasonography(US) represents a safe, inexpensive, noninvasive, portable, and wide availability. This paper compares the relative values of CT and US in the diagnosis of both fractures. In nasal bone fracture, US proved to be more accurate than CT. Thirty-seven nasal bone fractures were diagnosed by US; whereas only thirty-two of these were revealed on CT. Compared with US, CT demonstrated 87% sensitivity. In examining medial orbital wall fracture, eight cases were diagnosed by CT; whereas seven of these were revealed on US. Compared with CT, US demonstrated 88% sensitivity. In medial orbital wall fracture, US was almost as accurate as CT. In this research, it is concluded that in the investigation of nasal bone fracture and medial orbital wall fracture, US is an accurate diagnostic modality and correlates well with CT.
Diagnosis*
;
Nasal Bone*
;
Orbit*
;
Radiography
;
Sensitivity and Specificity
2.Absorbed doses in organs of the head and neck from conventional temporomandibular joint tomography.
Journal of Korean Academy of Oral and Maxillofacial Radiology 1999;29(2):411-416
PURPOSE: This study was done to evaluate the absorbed doses in organs of the head and neck for the conventional temporomandibular joint tomography. MATERIALS AND METHODS: Dosimetry was performed with 32 LiF thermoluminescent dosimeters, which were placed in a tissue-equivalent phantom when the temporomandibular joint was examined by both lateral and frontal temporomandibular joint tomography. RESULTS: For lateral tomography, parotid gland and preauricular area towards tube showed relatively high absorbed dose of 1056.9 microGy and 519.9 microGy respectively. For frontal tomography, the two largest absorbed doses were 259.2 microGy in orbit towards tube and 212.0 microGy in lens towards tube. CONCLUSION: Conventional temporomandibular joint tomography showed relatively low absorbed doses on critical organs. Thus, responsible use of it may not be limited.
Head*
;
Neck*
;
Orbit
;
Parotid Gland
;
Radiation Dosage
;
Radiography
;
Temporomandibular Joint*
3.Individual 3-D image prototyping models for orbital reconstruction.
Li-song LIN ; Wei WANG ; Zhi-hong WANG ; Zuo-liang QI ; Xiong-zheng MU ; Jian-jun CHEN
Chinese Journal of Plastic Surgery 2006;22(2):95-98
OBJECTIVETo fabricate a rapid prototyping (RP) 3-D image models for individual reconstruction of orbital bony loss.
METHODSThe skull was placed on a helical CT scanner table and the Frankfort plane was perpendicular to the table. The CT data was obtained by a Aquilion (TOSHIBA, Japan) with 1 mm thickness section in spiral mode. By adjusting of CT threshold value and pixels in order to stack the segmental defects, we obtained an approximate 3-dimension visual model of the scanned skull using MedGraphics software. An orbital RP model based on the dataset of the 3-dimension visual model was fabricated by RP machine. Both 3-dimension visual model and RP model were measured against the skull with several anatomic landmarks to examine the accuracy of the models, and the errors were analysed.
RESULTSIntegrity precision rapid RP models of the orbital region were reconstructed. The anterior orbital rim, middle orbital section and posterior orbital section were all fabricated. Optic foramen, superior orbital fissure, infraorbital foramen, inferior orbital fissure, lacrimal sac socket and naso-lacrimal duct were shown clearly. But some fine hole and slot, such as the anterior ethmoidal foramen, posterior ethmoidal foramen and zygomaticofrontal suture were not obviously seen. The mean difference between the 3-dimension visual model and the skull was 0.10 +/- 1.02mm. For the RP and dry skull, the mean difference was 0.22 +/- 1.04mm. There were no statistical differences between them.
CONCLUSIONSIntegrity precision orbital RP models were fabricated which fulfilled the requirements of the individual reconstruction with bony orbital pathologic changes. The keys to fabricate the precision orbital RP models included a closer cooperation between the surgeon and engineer, thin CT slice in 1mm thick and an appropriated threshold value. Better results for the orbital deformities should be achieved for the contour of orbital region or eye function.
Humans ; Image Processing, Computer-Assisted ; methods ; Models, Anatomic ; Orbit ; anatomy & histology ; diagnostic imaging ; Radiography
4.Relations between Age, Weight, Refractive Error and Eye Shape by Computerized Tomography in Children.
Ha Tae SONG ; Young Jun KIM ; Soo Jung LEE ; Yeon Sung MOON
Korean Journal of Ophthalmology 2007;21(3):163-168
PURPOSE: To investigate relationships between age, weight, refractive error, and morphologic changes in children's eyes by computerized tomography (CT). METHODS: Of the 772 eyes of 386 patients under the age of 20 years, who visited our Department of Ophthalmology between January 2005 to August 2006 and underwent CT of the orbit, 406 eyes of 354 patients with clear CT images and normal eyeball contour were enrolled in the present retrospective study. The axial lengths, widths, horizontal and vertical lengths, refractive errors, and body weight of eyes were measured, and relationship between these parameters were investigated. RESULTS: Axial length was found to correlate significantly with eye width (r=0.914), and in emmetropic eyes and myopic eyes, axial lengths and widths were found to increase as age and body weight increased. Axial lengths increased rapidly until age 10, and then increased slowly. In emmetropic eyes, widths / axial lengths increased with age, but in myopic eyes these decreased as age or severity of myopia increased. Moreover, as age increased, the myopic population and severity also increased. CONCLUSIONS: The axial length was longer in case of myopia compared to emmetropia in all age groups and there was almost no difference in the increase rate of axial length by the age of myopia and emmetropia. However, the width was wider in case of myopia compared to emmetropia in all age groups and the increase rate of width in myopia by age was smaller than that of emmetropia. Myopia showed decreasing rate of width/axial length with increase of age, from 1.004 in 5 years to 0.971 in 20 years. However, emmetropia showed increasing rate of width/axial length with increase of age, from 0.990 in 5 years to 1.006 in 20 years.
Adolescent
;
*Aging
;
*Body Weight
;
Child
;
Child, Preschool
;
Eye/*radiography
;
Female
;
Humans
;
Male
;
Myopia/*radiography
;
Orbit/radiography
;
Retrospective Studies
;
*Tomography, X-Ray Computed
5.A case of retained wooden foreign body in orbit.
Korean Journal of Ophthalmology 2002;16(2):114-118
A 41-year-old man visited our clinic complaining of esodeviation of the right eye. He had been operated on for corneal laceration 3 years before. One month later, exodeviation of the right eye had developed. The result of computed tomography (CT) was reported as orbital abscess and cellulitis. Although antibiotic treatment was administered for 2 weeks, the exodeviation didn't improve. On ocular examinations performed in our hospital in November-2001, his right eye was esotropic and had a relative afferent pupillary defect. Vision of the right eye was decreased to 0.02. Fundus examination showed optic atrophy. A new CT scan disclosed a foreign body introduced into the right medial orbital wall, nasal cavity and ethmoidal sinus. Although foreign body was surgically removed, vision and eye movement were not improved. In the case of a patient who has undergone orbital trauma, complete history taking and physical examinations must be performed. On suspicion of a foreign body, imaging study such as CT or MRI must be performed. However, because CT findings can be variable, careful follow-up is needed.
Adult
;
Eye Foreign Bodies/*radiography/surgery
;
Eye Injuries, Penetrating/*radiography/surgery
;
Human
;
Male
;
Ophthalmologic Surgical Procedures
;
Orbit/*injuries/radiography
;
Tomography, X-Ray Computed
;
*Wood
6.Visibility of Sutures of the Orbit and Periorbital Region Using Multidetector Computed Tomography.
Hubert GUFLER ; Markus PREIB ; Sabrina KOESLING
Korean Journal of Radiology 2014;15(6):802-809
OBJECTIVE: Knowledge of cranial suture morphology is crucial in emergency medicine, forensic medicine, and maxillofacial reconstructive surgery. This study assessed the visibility of sutures of the orbit and periorbital region on multidetector computed tomography. MATERIALS AND METHODS: Multidetector computed tomography scans of 200 patients (127 males, 73 females; mean age 51.3 years; range, 6-92 years) were evaluated retrospectively. The slice thicknesses varied from 0.5 to 1 mm, and the tube current from 25 to 370 mAs, depending on the CT indication. The visibility of sutures was estimated according to a 4-point scale from "not visible" to "well visible". The chi-squared test was used to test the association of the visibility of sutures with the slice thickness, tube current, and age of patients. Statistical significance was assumed at p < 0.05. RESULTS: Overall, best visibility was found for the sutura frontozygomatica (98%), sutura frontonasalis (88.5%), and sutura sphenozygomatica (71.5%), followed by the sutura zygomaticomaxillaris (65.8%), sutura temporozygomatica (41.8%), sutura frontomaxillaris (44.5%), and sutura sphenofrontalis (31%). Poor visibility was found for the sutura frontolacrimalis (16.8%) and sutura frontoethmoidalis (1.3%). The sutura ethmoidomaxillaris, sutura lacrimomaxillaris, and sutura ethmoidolacrimalis were not visible. CONCLUSION: Although the sutures of the superior, lateral, and inferior orbit are well visible, those of the medial orbit are poorly visible on CT scans.
Adolescent
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Adult
;
Age Factors
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Aged
;
Aged, 80 and over
;
Child
;
Craniocerebral Trauma/pathology/radiography
;
Female
;
Humans
;
Male
;
Middle Aged
;
Multidetector Computed Tomography
;
Orbit/*radiography
;
Retrospective Studies
;
*Sutures
;
Young Adult
7.Orbital fat prolapse and dermolipoma: two distinct entities.
Yoon Duck KIM ; Robert A GOLDBERG
Korean Journal of Ophthalmology 1994;8(1):42-43
A subconjunctival orbital fat prolapse is frequently confused with a dermolipoma clinically. These two entities have similar clinical appearances, but are clearly distinct. The clinical features, differential diagnosis, and treatment modalities of subconjunctival orbital fat prolapse and dermolipoma are discussed.
Adipose Tissue/*pathology
;
Adult
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Female
;
Humans
;
Lipoma/*diagnosis
;
Male
;
Middle Aged
;
Orbit/pathology/radiography
;
Orbital Diseases/*diagnosis
;
Orbital Neoplasms/*diagnosis
;
Prolapse
8.Orbital fat prolapse and dermolipoma: two distinct entities.
Yoon Duck KIM ; Robert A GOLDBERG
Korean Journal of Ophthalmology 1994;8(1):42-43
A subconjunctival orbital fat prolapse is frequently confused with a dermolipoma clinically. These two entities have similar clinical appearances, but are clearly distinct. The clinical features, differential diagnosis, and treatment modalities of subconjunctival orbital fat prolapse and dermolipoma are discussed.
Adipose Tissue/*pathology
;
Adult
;
Female
;
Humans
;
Lipoma/*diagnosis
;
Male
;
Middle Aged
;
Orbit/pathology/radiography
;
Orbital Diseases/*diagnosis
;
Orbital Neoplasms/*diagnosis
;
Prolapse
9.Recurrence after exenteration for canine orbital malignant schwannoma.
Seonmi KANG ; Jungwhan YANG ; Yesran LEE ; Hyomyeong PYO ; Jaehoon KIM ; Kangmoon SEO
Journal of Veterinary Science 2017;18(1):115-118
A 14-year-old Maltese dog presented with progressive exophthalmos and external deviation of the right eye. Ultrasonography revealed the presence of a retrobulbar mass and fine-needle aspiration cytology was performed, which detected a malignant mass. There was no evidence of metastasis on thoracic and abdominal radiography. Computed tomography showed no invasion into the bony orbit and no metastasis to the lung or lymph nodes. Exenteration was performed to remove the mass completely. Malignant peripheral nerve sheath tumor was confirmed by histopathological examination.
Adolescent
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Animals
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Biopsy, Fine-Needle
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Dogs
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Exophthalmos
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Humans
;
Lung
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Lymph Nodes
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Neoplasm Metastasis
;
Neurilemmoma*
;
Orbit*
;
Peripheral Nerves
;
Radiography, Abdominal
;
Recurrence*
;
Ultrasonography
10.Transcaruncular Approach to Blowout Fractures of the Medial Orbital Wall.
Joo yeon OH ; Sang hoon RAH ; Yoon hee KIM
Korean Journal of Ophthalmology 2003;17(1):50-54
Transcutaneous and transconjunctival approaches are still frequently used to repair orbital wall fractures. However, medial orbital wall fracture remains a challenging area for plastic surgeons due to technical difficulties and postoperative scars. The transcaruncular approach is described and we present our experience with this approach to access the medial orbital wall in 10 patients with blowout fracture in the medial orbital region. All patients were corrected satisfactorily without cutaneous scar. The transcaruncular approach is a useful technique to repair medial orbital wall fractures.
Adolescent
;
Adult
;
Female
;
Human
;
Male
;
Middle Aged
;
*Ophthalmologic Surgical Procedures
;
Orbit/radiography/*surgery
;
Orbital Fractures/diagnosis/*surgery
;
Postoperative Period
;
Tomography, X-Ray Computed
;
Treatment Outcome