The validity and reliability of computed tomography orbital volume measurements

2017 ◽  
Vol 45 (9) ◽  
pp. 1552-1557 ◽  
Author(s):  
Silviu C. Diaconu ◽  
David Dreizin ◽  
Mehmet Uluer ◽  
Corey Mossop ◽  
Michael P. Grant ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Validity And Reliability ◽  
Orbital Volume ◽  
Volume Measurements

Comparison of Hand and Semiautomatic Tracing Methods for Creating Maxillofacial Artificial Organs using Sequences of Computed Tomography (CT) and Cone Beam Computed Tomography (CBCT) Images

2017 ◽  
Vol 40 (6) ◽  
pp. 307-312 ◽  
Author(s):  
Bence T. Szabo ◽  
Seçil Aksoy ◽  
Gabor Repassy ◽  
Krisztian Csomo ◽  
Csaba Dobo-Nagy ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Volume Measurement ◽  
Artificial Organs ◽  
Cone Beam ◽  
Artificial Organ ◽  
Volume Determination ◽  
Measurement Results ◽  
Volume Measurements ◽  
Maxillary Sinuses

Introduction The aim of this study was to compare the paranasal sinus volumes obtained by manual and semiautomatic imaging software programs using both CT and CBCT imaging. Methods 121 computed tomography (CT) and 119 cone beam computed tomography (CBCT) examinations were selected from the databases of the authors’ institutes. The Digital Imaging and Communications in Medicine (DICOM) images were imported into 3-dimensonal imaging software, in which hand mode and semiautomatic tracing methods were used to measure the volumes of both maxillary sinuses and the sphenoid sinus. The determined volumetric means were compared to previously published averages. Results Isometric CBCT-based volume determination results were closer to the real volume conditions, whereas the non-isometric CT-based volume measurements defined coherently lower volumes. By comparing the 2 volume measurement modes, the values gained from hand mode were closer to the literature data. Furthermore, CBCT-based image measurement results corresponded to the known averages. Conclusions Our results suggest that CBCT images provide reliable volumetric information that can be depended on for artificial organ construction, and which may aid the guidance of the operator prior to or during the intervention.

Effect of mannitol on globe and orbital volumes in humans

2018 ◽  
Vol 28 (2) ◽  
pp. 163-167 ◽  
Author(s):  
Adam C. Weber ◽  
Alexander D. Blandford ◽  
Bryan R. Costin ◽  
Julian D. Perry
Keyword(s):  
Volume Change ◽  
Cleveland Clinic ◽  
Retrospective Chart Review ◽  
Consecutive Series ◽  
Orbital Volume ◽  
Computed Tomographic ◽  
Before And After ◽  
Pressure Lowering ◽  
Volume Measurements

Purpose: To determine the effect of intravenous mannitol on globe and orbital volumes. Methods: Retrospective chart review of a consecutive series of Cleveland Clinic Neurosurgical Intensive Care Unit patients who underwent computed tomographic imaging before and after intravenous mannitol administration. Volume measurements were performed according to a previously described technique by averaging axial image areas. Measurements before and after mannitol administration were compared using paired t-test. Results: Fourteen patients (28 eyes) met inclusion criteria. Average globe volume decreased 186 mm3 (-2.5%, p = 0.02) after mannitol administration, while average orbital volume increased 353 mm3 (+3.5%, p = 0.04). Average globe volume change for subjects with follow-up scan less than 4.7 hours (mean 1.9 hours; range 0.2-4.5 hours) after mannitol administration was -125 mm3 (-1.7%, p = 0.24) and average orbital volume change was +458 mm3 (+5.1%, p = 0.11). Average globe volume change after mannitol administration for those with follow-up more than 4.7 hours (average 13.9 hours, range 4.9-24.7 hours) was -246 mm3 (-3.3%, p = 0.05) and orbital volume change was +248 mm3 (+2.2%, p = 0.24). Dividing the study population into groups based on mannitol dose did not yield any statistically significant change. Conclusions: Human globe volume decreases after intravenous mannitol administration, while orbital volume increases. These volume changes occur during the time period when intraocular pressure normalizes, after the pressure-lowering effects of the drug. This novel volumetric information improves our understanding of mannitol’s mechanism of action and its effects on human ocular and periocular tissues.

Measurements of Orbital Volume Change Using Computed Tomography in Isolated Orbital Blowout Fractures

2009 ◽  
Vol 11 (6) ◽  
pp. 395-398
Author(s):  
Jaehwan Kwon ◽  
Jose E. Barrera ◽  
Tae-Young Jung ◽  
Sam P. Most
Keyword(s):  
Computed Tomography ◽  
Volume Change ◽  
Orbital Volume ◽  
Orbital Blowout Fractures

scholarly journals Relationship between Degree of Enophthalmos and Orbital Volume Measured with Computed Tomography in Isolated Blowout Fractures of the Orbit

2009 ◽  
Vol 52 (10) ◽  
pp. 810 ◽  
Author(s):  
Joon Jeon ◽  
Kyong Myong Chon ◽  
Tae Young Jung ◽  
Woong Jae Noh ◽  
Jae Hwan Kwon ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Orbital Volume

Dependence of computed tomography volume measurements upon section thickness: An application to human dry skulls

2008 ◽  
Vol 21 (6) ◽  
pp. 479-485 ◽  
Author(s):  
Bunyamin Sahin ◽  
Michael Mazonakis ◽  
Huseyin Akan ◽  
Suleyman Kaplan ◽  
Yuksel Bek
Keyword(s):  
Computed Tomography ◽  
Section Thickness ◽  
Volume Measurements
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