A499 Hiatal Surface Area CT scan measurement is useful in hiatal hernia’s treatment of bariatric patients

2019 ◽  
Vol 15 (10) ◽  
pp. S206-S207
Author(s):  
Cristian Eugeniu Boru ◽  
Gianfranco Silecchia
Keyword(s):  
Ct Scan ◽  
Surface Area ◽  
Hiatal Surface Area ◽  
Bariatric Patients

scholarly journals A Protocol to Reduce Interobserver Variability in the Computed Tomography Measurement of Orbital Floor Fractures

2015 ◽  
Vol 8 (4) ◽  
pp. 289-298 ◽  
Author(s):  
ChuanHan Ang ◽  
JinRong Low ◽  
JiaYi Shen ◽  
Elijah Zheng Yang Cai ◽  
Eileen Chor Hoong Hing ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Ct Scan ◽  
Surface Area ◽  
Interobserver Variability ◽  
Intraclass Correlation ◽  
Orbital Floor ◽  
Orbital Fracture ◽  
Orbital Fractures ◽  
Fracture Detection ◽  
Orbital Floor Fractures

Orbital fracture detection and size determination from computed tomography (CT) scans affect the decision to operate, the type of surgical implant used, and postoperative outcomes. However, the lack of standardization of radiological signs often leads to the false-positive detection of orbital fractures, while nonstandardized landmarks lead to inaccurate defect measurements. We aim to design a novel protocol for CT measurement of orbital floor fractures and evaluate the interobserver variability on CT scan images. Qualitative aspects of this protocol include identifying direct and indirect signs of orbital fractures on CT scan images. Quantitative aspects of this protocol include measuring the surface area of pure orbital floor fractures using computer software. In this study, 15 independent observers without clinical experience in orbital fracture detection and measurement measured the orbital floor fractures of three randomly selected patients following the protocol. The time required for each measurement was recorded. The intraclass correlation coefficient of the surface area measurements is 0.999 (0.997–1.000) with p-value < 0.001. This suggests that any observer measuring the surface area will obtain a similar estimation of the fractured surface area. The maximum error limit was 0.901 cm2 which is less than the margin of error of 1 cm2 in mesh trimming for orbital reconstruction. The average duration required for each measurement was 3 minutes 19 seconds (ranging from 1 minute 35 seconds to 5 minutes). Measurements performed with our novel protocol resulted in minimal interobserver variability. This protocol is effective and generated reproducible results, is easy to teach and utilize, and its findings can be interpreted easily.

scholarly journals Hiatal Surface Area's CT scan measurement is useful in hiatal hernia's treatment of bariatric patients

2019 ◽  
pp. 1-8 ◽  
Author(s):  
Cristian E. Boru ◽  
Marco Rengo ◽  
Angelo Iossa ◽  
Francesco De Angelis ◽  
Matteo Massaro ◽  
...  
Keyword(s):  
Ct Scan ◽  
Bariatric Patients

scholarly journals A Retrospective Study on the Morphology of Posterior Malleolar Fractures Based on a CT Scan: Whether We Ignore the Importance of Fracture Height

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Zhifeng Wang ◽  
Chengjie Yuan ◽  
Genrui Zhu ◽  
Xiang Geng ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Ct Scan ◽  
Surface Area ◽  
Articular Surface ◽  
Area Ratio ◽  
Ankle Injury ◽  
Average Height ◽  
Malleolar Fracture ◽  
Malleolar Fractures ◽  
Posterior Malleolar Fracture ◽  
Fracture Area

Objective. The aim of this study was to investigate the respective correlation between the height (H) of a posterior malleolar fracture (PMF) and the involved area (S) of an articular surface and the presence of “die-punch.” Methods. Patients with closed posterior malleolar fractures admitted to our hospital from January 2015 to December 2017 were selected, with complete X-ray and 3D reconstruction CT imaging data. The gender, age, injured side, and surgical fixation methods of the patients were recorded. A preoperative ankle CT scan was performed, and the images were viewed through the PACS (Picture Archiving and Communication Systems). Simultaneously, the involved joint surface area (S) by the posterior malleolar fracture was measured, as well as the proportion of the fracture area to the total ankle joint area. On the sagittal reconstruction CT images, the height (H) of the posterior malleolar fracture was measured to compare the correlation between the height of the fracture and the area of the fracture, as well as the area ratio. Besides, according to the presence or absence of “die-punch,” patients were divided into two groups: A and B. And each group was further divided into three subgroups according to age (16-39 years old, 40-59 years old, and ≥60 years old). The statistical differences in the height of fracture between the subgroups were compared. Results. A total of 48 patients, aged 16-82 years, with an average age of 48.9 years, were included in this study, including 13 males and 35 females. There were 20 cases of left ankle injury and 28 cases of right ankle injury. The average height of the posterior malleolar fractures was 18.19 mm, the average area of the fracture was 202.28 mm2, and the average ratio of the fracture area to the total articular surface area was 17.84%. Besides, die-punch was seen in 27 cases and not in 21 cases. The average height of fractures was 21.33±5.38 mm in group A1, 14.38±9.01 mm in group B1, 18.30±7.95 mm in group A2, 14.48±5.37 mm in group B2, 26.26±6.73 mm in group A3, and 12.77±3.07 mm in group B3. Conclusion. The height (H) of the posterior malleolar fractures is positively correlated with the fracture area (S) and the fracture area ratio (FAR). The posterior malleolar fractures with “die-punch” tend to have a greater average height than that without “die-punch.” In clinical work, orthopedic surgeons should not only pay attention to the size of the posterior malleolus fracture but also value its height, which hopefully could provide insight into the treatment and prognosis of PMF patients.

The Effect of Linear Energy Transfer, Particle and Energy Fluence on Renal Surface Area during Abdominal CT Scan

2017 ◽  
pp. 671-677
Author(s):  
Issahaku Shirazu ◽  
Cyril Schandorf ◽  
Y. B. Mensah ◽  
S. Y. Mensah ◽  
Theophilus Sackey ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Ct Scan ◽  
Surface Area ◽  
Linear Energy Transfer ◽  
Mean Value ◽  
Abdominal Ct ◽  
Male And Female ◽  
Energy Fluence ◽  
Scan Time ◽  
Abdominal Ct Scan

The quantities that determine the relative image noise level by either increasing or reducing its value are photon quality (kVp) and photon quantity (mAs). This study is to determine the effect of LET, energy and particle fluence on the renal surface area during abdominal CT scan. The method involve extracting three exposure parameters from image data using MVL DICOM application software including: kVp, mA and scan time. The kVp or the photon peak energy which is applied in the A-P direction during abdominal CT scan was used to estimate linear energy transfer. While the particle fluence and the energy fluence were estimated from the effective mAs and the kVp on the total renal surface respectively. The effective mAs were estimated by dividing the mAs by the average pitch factor of approximately 0.813. In all the examinations, the average protocol setting in terms of exposure time and kilovolts peak were 500s and 120keV respectively. While the average protocol in all the centers recorded a mean effective milliamp second (mAs) of 59.27 mAs and tube current of 94.22A. The influence of these parameters on abdominal scan depends on the scan time, scan scope, the size of the renal surface area (RSA) which has varied values. The effects of effective mean mAs per unit mean renal surface area, described as mean effective particle fluence were 1.32mAs/cm2 and 1.50 mAs/cm2 for male and female respectively. The energy fluence, which is the photon energy per unit renal surface area estimated to have a mean value of 4.02 keVcm-2 and 4.51 keVcm-2 for male and female respectively. In addition, the maximum and minimum variations of all the measured parameters. The LET, which described the lost in photon energy as it traverses across the renal tissues in the A-P direction was estimated, with a mean value of 2.60 keV/µm and 2.67 keV/µm for male and female respectively. The maximum and minimum LET values were 4.49 keV/µm and 1.90 keV/µm for male and 5.26 keV/µm and 1.98 keV/µm for female respectively. The maximum measured values were below the critical LET values estimated to be between 15 to 20 keV/µm. These estimated risk parameters were used to predict the effect on abdominal and kidney tissues using the various modeled equations.

Hiatal surface area as a basis for a new classification of hiatal hernia

2013 ◽  
Vol 28 (4) ◽  
pp. 1384-1385 ◽  
Author(s):  
Stavros A. Antoniou ◽  
Rudolph Pointner ◽  
Frank-Alexander Granderath
Keyword(s):  
Hiatal Hernia ◽  
Surface Area ◽  
New Classification ◽  
Hiatal Surface Area

scholarly journals The valid diagnostic parameters in static bilateral CT scan to predict unstable syndesmotic injury with ankle fracture

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0031
Author(s):  
Si Wook Lee
Keyword(s):  
Ct Scan ◽  
Surface Area ◽  
Ankle Fracture ◽  
Ct Scans ◽  
Syndesmotic Injury ◽  
Roc Curve Analysis ◽  
Uninjured Side ◽  
Significant Difference ◽  
Posterior Translation ◽  
Preoperative Ct

Category: Trauma Introduction/Purpose: The purpose of this study is to evaluate valid and reasonable parameters to predict syndesmotic injury in ankle fracture. Methods: Seventy patients who underwent preoperative bilateral CT scans were enrolled retrospectively. On preoperative x-ray, tibiofibular overlap (TFO) and tibiofibular clear space (TFCS) were measured. On preoperative CT scan, anterior fibular distance (AFD), posterior fibular distance (PFD), anterior translation distance (AT), fibular diastasis (FD), anterior-posterior translation (APT), fibular length (FL), surface area of syndesmosis (SAS), surface area of syndesmosis of 1.5 cm above the ankle joint line (SAS1.5) were measured. Those measured values were divided with those of uninjured side, in order to minimize the differences among the individuals. Results: Statistically significant differences has been shown between The measurements of ratio (Injured/Uninjured) of TFO, PFD, APT, Diastasis, and SAS of groups which required transfixation have shown statistically significant difference, compared to those of groups which did not require transfixation. Other measurements were not showing significant difference. Furthermore, using ROC curve analysis, a ratio of measurement which is the most reasonable to predict transfixation was SAS (95% confidence interval = 0.598 – 0.869, cut of value = 1.555) Conclusion: Measuring TFO, PFD, APT, Diastasis, and SAS from CT scans and comparing with uninjured side preoperatively can provide surgeon an reasonable evidence to perform transfixation intraoperatively

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