• Progress in Medical Physics
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• v.30 no.1
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• pp.1-6
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• 2019

Purpose: This study conducts a comparative evaluation of the skin dose in CyberKnife (CK) and Helical Tomotherapy (HT) to predict the accurate dose of radiation and minimize skin burns in head-and-neck stereotactic body radiotherapy. Materials and Methods: Arbitrarily-defined planning target volume (PTV) close to the skin was drawn on the planning computed tomography acquired from a head-and-neck phantom with 19 optically stimulated luminescent dosimeters (OSLDs) attached to the surface (3 OSLDs were positioned at the skin close to PTV and 16 OSLDs were near sideburns and forehead, away from PTV). The calculation doses were obtained from the MultiPlan 5.1.2 treatment planning system using raytracing (RT), finite size pencil beam (FSPB), and Monte Carlo (MC) algorithms for CK. For HT, the skin dose was estimated via convolution superposition (CS) algorithm from the Tomotherapy planning station 5.0.2.5. The prescribed dose was 8 Gy for 95% coverage of the PTV. Results and Conclusions: The mean differences between calculation and measurement values were $-1.2{\pm}3.1%$, $2.5{\pm}7.9%$, $-2.8{\pm}3.8%$, $-6.6{\pm}8.8%$, and $-1.4{\pm}1.8%$ in CS, RT, RT with contour correction (CC), FSPB, and MC, respectively. FSPB showed a dose error comparable to RT. CS and RT with CC led to a small error as compared to FSPB and RT. Considering OSLDs close to PTV, MC minimized the uncertainty of skin dose as compared to other algorithms.

• Progress in Medical Physics
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• v.20 no.3
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• pp.174-179
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• 2009

To track moving tumor in real time, CyberKnife system imports a technique of the synchrony respiratory tracking system. The fiducial marker which are detectable in X-ray images were demand in CyberKnife Robotic radiosurgery system. It issued as reference markers to locate and track tumor location during patient alignment and treatment delivery. Fiducial marker implantation is an invasive surgical operation that carries a relatively high risk of pneumothorax. Most recently, it was developed a direct lung tumor registration method that does not require the use of fiducials. The purpose of this study is to measure the accuracy of target applying X-sight lung tracking using the Gafchromic film in dynamic moving thorax phantom. The X-sight Lung Tracking quality assurance motion phantom simulates simple respiratory motion of a lung tumor and provides Gafchromic dosimetry film-based test capability at locations inside the phantom corresponding to a typical lung tumor. The total average error for the X-sight Lung Tracking System with a moving target was $0.85{\pm}0.22$ mm. The results were considered reliable and applicable for lung tumor treatment in CyberKnife radiosurgery system. Clinically, breathing patterns of patients may vary during radiation therapy. Therefore, additional studies with a set real patient data are necessary to evaluate the target accuracy for the X-sight Lung Tracking system.

• Journal of radiological science and technology
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• v.33 no.4
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• pp.379-386
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• 2010

This study evaluated the motion of tumors during the entire period of therapy and the accuracy of radiosurgery among forty eight lung tumor patients who were underwent radiosurgery using the CyberKnife Synchrony Respiratory Tracking System. The motion of lung tumor was measured by the coordinates of a gold acupuncture needle inserted into the tumor or the area around the tumor using the CyberKnife image guided system. Then the accuracy of radiosurgery was evaluated based on the error of correlation computed with the motion tracking system. The lung tumor motion is Cranio-Caudal direction by an average of $2.63{\pm}1.87\;mm$, moved left-right direction by $1.13{\pm}0.71\;mm$, and anterior-posterior direction by $1.74{\pm}1.16\;mm$. The degree of rotational movement was $1.66{\pm}1.66^{\circ}$ on X axis, $1.20{\pm}0.97^{\circ}$ on Y axis, and $1.18{\pm}0.73^{\circ}$ on Z axis. The vector of translation movement was measured to be $3.78{\pm}2.00\;mm$ on the average. The results show that directions of Cranio-Caudal(p < 0.001), anterior-posterior direction(p < 0.029), and three dimensional vector value(p < 0.002) showed statistical significance, because the lower side of tumor showed more intensive movement compared to the upper side of tumor. The radiosurgery was carried out by compensating the motion of tumor after accurate investigation of the correlation error with the average of $0.95{\pm}0.62\;mm$ during the lung tumor radiosurgery with the CyberKnife Synchrony Respiratory Tracking System.

• Journal of The Korean Society of Integrative Medicine
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• v.8 no.1
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• pp.193-202
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• 2020

Purpose : The objective of this study was to provide information about the need and perception of continuing education(CE) according to gender in physical therapists. This study also aimed to provide basic data for the improvement of quality of the CE program with physical therapists. Methods : The study analyzed basic data from Korea Physical Therapy Association regarding the 350 physical therapists in Gwangju metropolitan city (Male; 102, female; 248). The questionnaire consisted of 3 categories: general characteristics, need of CE, and perception. For need of CE and perception, it assessed using a 5-point Likert scale. Data were analyzed using frequency analysis, and simple regression analysis using dummy variable. Results : The need of CE showed a weak positive correlation in the only the pediatric physical therapy according to gender in physical therapists (R²=.012) (p<.05). Both male and female physical therapists had the highest need in the musculoskeletal system, followed by nervous system. The perception of CE were not significantly correlated according to gender in physical therapists (p>.05). Both male and female physical therapists were high on the cyber-CE (Q4) and on the need for CE (Q1, Q2, Q3). Whereas, a lower score was found in category that CE helped in the performance of the work (Q6, Q7, Q8). Conclusion : In this study, there was little or no significant correlation between need and perception of CE according to gender in physical therapists. Both male and female physical therapists recognize the need for CE, whereas they are less satisfied the efforts of CE in the performance of the work. Therefore, improvement of CE through various programs should be made to enhance the perception of CE.

• Korean Journal of Human Ecology
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• v.21 no.5
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• pp.903-913
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• 2012

This study investigated the effects of depression, anxiety, and impulsiveness on suicidal thoughts among adolescents with the goal of better understanding the psychological needs of adolescents and to provide them with more effective counseling and guidance. Participants for this study included 340 high school students in their first and second year living in large urban centers. Respondents answered a questionnaire that documented their experiences related to depression, anxiety, impulsiveness, and suicidal thoughts. Data analysis was performed using the means, standard deviations, correlation analysis, and multiple regression using the IBM SPSS 19.0 statistics program. The results were as follows. There was no statistically significant difference in anxiety and impulsiveness based on gender. However, female respondents demonstrated a higher rate of suicidal thoughts than male respondents. Second, in both sexes, comparative analysis between depression, anxiety, impulsiveness, and suicidal thoughts revealed that respondents with higher levels of depression and anxiety demonstrated elevated levels of suicidal thoughts. Impulsiveness demonstrated a correlation with suicidal thoughts only for female participants. Third, while depression and anxiety affected suicidal thoughts in both male and female respondents, impulsiveness did not affect suicidal thoughts, with depression having the strongest effect.

• Radiation Oncology Journal
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• v.24 no.1
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• pp.11-20
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• 2006

Puroose: In order to find out whether stereotactic radiation therapy (RT) using CyberKnife (CK) could improve survival rate and lower acute toxicity compared to conventional RT. Materials and Methods: From April 2003 through April 2004, 19 patients with Eastern Cooperative Oncology Group (ECOG) performance status ${\leq}3$ and locally advanced pancreas cancer without distant metastasis, evaluated by CT or PET/CT, were included. We administered stereotactic RT consisting of either 33 Gy, 36 Gy or 39 Gy in 3 fractions to 6, 4 and 9 patients, respectively, in an effort to increase the radiation dose step by step, and analyzed the survival rate and gastrointestinal toxicities by the acute radiation morbidity criteria of Radiation Therapeutic Oncology Group (RTOG). Prognostic factors of age, sex, ECOG performance score, chemotherapy, bypass surgery, radiation dose, CA 19-9, planning target volume (PTV), and adjacent organ and vessel invasion on CT scan were evaluated by Log Rank test. Results: The median survival time was 11 months with 1-year survival rate of 36.8%. During follow-up period (range $3{\sim}20$ months, median 10 months), no significant gastrointestinal acute toxicity (RTOG grade 3) was observed. In univariate analysis, age, sex, ECOG performance score, chemotherapy, bypass surgery, radiation dose, CA 19-9 level, and adjacent organ and vessel invasion did not show any significant changes of survival rate, however, patients with PTV (80 cc showed more favorable survival rate than those with PTV>80 cc (p-value<0.05). In multivariate analysis, age younger than 65 years and PTV>80 cc showed better survival rate. Conclusion: In terms of survival, the efficacy of stereotactic radiation therapy using CK was found to be superior or similar to other recent studies achieved with conventional RT with intensive chemotherapy, high dose conformal RT, intraoperative RT (IORT), or intensity modulated RT (IMRT). Furthermore, severe toxicity was not observed. Short treatment time in relation to the short life expectancy gave patients more convenience and, finally, quality of life would be increased. Consequently, this could be regarded as an effective novel treatment modality for locally advanced, unresectable pancreas cancer. PTV would be a helpful prognostic factor for CK.

• Industry Promotion Research
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• v.7 no.3
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• pp.65-70
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• 2022

The purpose of this study was to investigate the child counselling process of a 5-year old girl with anger problem. Her mother had difficult on caring a child. The researcher conducted 47 session of child counseling through child-centered play therapy once per week during 14months for 40 minutes. Parent consultation session follwed for 10 minutes. The child expressed her aggression, control, desire of affection and power during the sessions. As a result, the child's anger decreased, and child-mother relationship improved. Finally, the child successfully adapted new school life. The mother reported that raising children was much easier than before. This study is meaningful that it is a case study of a child's intervention in counseling prior to her entering elementary school. This study showed her adaptive school lifestyle during the beginning of the first year.

• Industry Promotion Research
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• v.7 no.3
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• pp.71-75
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• 2022

The purpose of this study was to investigate the child counselling process of a 6-year old girl. The child has showed inattention and impulsity. Her mother had difficulty on caring a child. The researcher conducted 63 session child counseling through play therapy once per week after tested clinical psychological full battery. During the counseling process, a child showed desire of affection and aggressive and impulsive behavior through the child's leading play. As a result the child's inattention and impulsivity decreased, and child-mother relationship improved. The child could express her feelings to their parents in concrete terms. Finally, the child successfully adapted new school life. The mother reported that raising children was much easier than before, and she decided to have a follow-up counseling once a month. This study is meaningful in that it is a case study conducted during 1 year and 8months since she was 6-year old. The young child becomes primary school girl. In this study, it was confirmed that children had an adaptive school life during the first and second grades.

• Radiation Oncology Journal
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• v.31 no.4
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• pp.260-266
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• 2013

A clear consensus has not been established regarding the best treatment for solitary bone metastasis. Here, we reviewed the medical records of patients with a controlled primary malignancy who had only solitary spine metastasis without metastasis to the extraspinal bone or viscera and underwent treatment between April 2007 and December 2012 with stereotactic body radiosurgery using CyberKnife, with a total dose of 24 Gy in three to four fractions. During that time, there were only four cases. This was effective in each case, and all the four patients had no local failure and remained alive at a median follow-up of 68 months (range, 64 to 80 months). Although our experience is limited, this study suggests that stereotactic body radiotherapy could be a feasible, safe, effective, and noninvasive alternative treatment for solitary spine metastasis in patients who are medically inoperable or unsuitable for surgery.

• Korean Medical Education Review
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• v.16 no.2
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• pp.57-66
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• 2014

Burnout research has mostly been performed in human service fields. However, it has recently been expanded to cover diverse settings and even non-occupational samples, such as students. In this study, we defined the construct of academic burnout, which is the burnout experienced by students. Next, we described the concept of academic burnout by introducing measurements for assessing academic burnout. On the basis of the demand-control model (DCM) and effort-reward imbalance model (ERIM), which are the most predominant theoretical burnout models, we described the causal factors and the pathway to experiencing academic burnout symptoms. The ERIM was a more influential model than the DCM when explaining the academic burnout of Korean students. Based on the results of previous longitudinal studies on academic burnout, we recognized emotional exhaustion and academic inefficacy as the initial symptoms of academic burnout. Finally, we discussed the prevention and intervention programs with specific components that should be included in those programs.