Journal Detail Information

1

Cite

Share

Experimental Computer-Based Management System of Patients in Radiation Oncology.

Ihl Bohng CHOI ; Choon Yul KIM ; Yong Whee BAHK

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):169-172.

Currently, many computer systems are used in many areas of medicine including radiation oncology. For the most part, the computer system has proved to be useful in radiotherapeutic planning and dose calculation. There has been attempts to develop computer system including information management of patients, patient tracing, and office automation in radiation oncology department. But some of these available commercial systems have shortcomings. We developed a management system of patients in our radiation oncology department that integrated most of items for the evaluation of patents. In particular, the data were stored in a natural language (noncoded) and made themselves easily understandable by all clinical groups. In addition, the data could be isolated in files from which the computer could generate graphs and static data by the use of some simple commands. The system provided us with not only the functions of case review but functions of preparation of conferences, lectures and resident teaching.
Computer Systems ; Congresses as Topic ; Humans ; Information Management ; Lectures ; Office Automation ; Radiation Oncology*

2

Cite

Share

Application of Generalized Batho Method to Arbitrary Shape of Heterogeneous Tissues.

Kyu Young CHAI

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):165-168.

The generalized Batho method, proposed by Webb and Fox, which is a method of calculation of dose correction factor for the multilayer of heterogeneous tissue, is complex even for a few kind of tissues. The method was modified for the purpose of getting a simple method that divide the multilayer of heterogeneous tissues into some groups of adjacent-tissue pairs. This new method could reduce the number of exponential terms and the time for calculating the dose correction factors by manual and computer calculation.

3

Cite

Share

Variation of Effective SSD According to Electron Energies and Irradiated Field Sizes.

Chil Yong YANG ; Ha Yong YUM ; Tae Sik JUNG

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):157-164.

It is known that fixed source to skin distance (SSD) cannot be used when the treatment field is sloped or larger than the size of second collimator in electron beam irradiation and inverse square law using effective ssd should be adopted. Effective SSDs were measured in different field sizes in each 6, 9, 12, 15 and 18 MeV electron energy by suing NELAC 1018D linear accelerator of Kosin Medical Center. We found important parmeters of effective SSD. 1. Minimum effective SSD was 58.8 cm in small field size of 6x6 cm and maximum effective SSD was 94.9 cm in large field size of 25x25 cm, with 6 MeV energy. It's difference was 36.1 cm. The dose rate at measuring point was quite different even with a small difference of SSD in small field (6x6 cm) and low energy (6 MeV). 2. Effective SSD increased with field size in same electron energy. 3. Effective SSDs gradually increased with the electron energies and reached maximum at 12 or 15 MeV electron energy and decreased again at 18 MeV electron energy in each identical field size. And so the effective SSD should be measured in each energy and field size for practical radiotherapy.
Jurisprudence ; Particle Accelerators ; Radiotherapy ; Silver Sulfadiazine* ; Skin

4

Cite

Share

The Effect of Therapy Oriented CT in Radiation Therapy Planning.

Sung Kyu KIM ; Sei One SHIN ; Myung Se KIM

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):149-156.

The success of radioation therapy depends on exact treatment of the tumor with significant high dose for maximizing local control and excluding the normal tissues for minimizing unwanted complications. To achieve these goals, correct estimation of target volume in three dimension, exact dose distribution in tumor and normal critical structures and correction of tissue inhomogeneity are required. The effect of therapy oriented CT (planning CT) were compared with conventional simulation method in necessity of planning change, set dose, and proper distribution of tumor dose. Of 365 new patients examined, planning CT was performed in 104 patients (28%). Treatment planning was changed in 47% of head and neck tumor, 79% of intrathoracic tumor and 63% of abdmonial tumor. In breast cancer and musculoskeletal tumors, planning CT was recommended for selection of adequate energy and calculation of exact dose to critical structures such as kidney or spinal cord. The average difference of tumor doses between CT planning and conventional simulation was 10% in intrathoracic and intra-abdominal tumors but 20% in head and neck tumors which suggested that tumor dose may be overestimated in conventional simulation. Although some limitations and disadvantages including the cost and irradiation during CT are still criticizing, our study showed that CT planning is very helpful in radiotherapy planning.
Breast Neoplasms ; Head ; Humans ; Kidney ; Neck ; Radiotherapy ; Spinal Cord

5

Cite

Share

Radiotherapy Treatment Planning in Head and Neck Cancer by CT-Reconstruction.

Samuel RYU ; In Kyu PARK

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):141-148.

The ultimate goal of radiotherapy is to result in complete local control of tumor while sparing the surrounding normal tissues as much as possible. Since the development of CT in 1970s, patient's anatomical normal tissues and the site and extent of infiltration of tumor were identified almost accurately. In addition, the isodose distribution of delivered radiation to target tumor was shown in each cross-section. In the treatment planning of head and neck cancers, CT-reconstruction provided almost 3-dimensinonal inter-relationship between tumor and normal tissues. The utilization of imaging system of the CT scanner made it possible to illustrate in superposition the patient structure image, the radiation beams, and the isodose distributions. Thus it was possible to deliver radiation enough to control the local disease, and to avoid unnecessary administration of radiation to normal tissue such as spinal cord. CT-reconstructed image in axial, sagittal, and coronal planes suggested 3-dimensional radiotherapy treatment planning be possible and practical instead of conventional 2-dimensional planning at coronal plane.
Head and Neck Neoplasms* ; Head* ; Humans ; Neck ; Radiotherapy* ; Spinal Cord

6

Cite

Share

Accuracy of Dose Estimation in High Dose Rate Intracavitary Radiotherapy of Carcinoma of the Uterine Cervix.

Seung Jae HUH ; Sung Whan HA ; Kyu Young CHOI

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):137-140.

In brachytherapy of uterine cervical cancer using a high dose rate remote afterloading system, it is of prime importance to deliver a accurate dose in each fractionated treatment by minimizing the difference between the pre-treatment planned and post-treatment calculated doses. The post-treatment calculated point A dose was not much different from the pretreatment planned dose (500 cGy). The average+/-standard deviation was 500+/-18 cGy and 84 percent of 82 intracavitary radiotherapy was within the range of 500+/-25 cGy.
Brachytherapy ; Cervix Uteri* ; Female ; Radiotherapy* ; Uterine Cervical Neoplasms

7

Cite

Share

Radiotherapy of Recurrent Uterine Cervical Cancer.

Sung Whan HA ; Charn Il PARK ; Kyu Young CHOI ; Soon Beom KANG ; Hyo Pyo LEE ; Myon Woo SHIN

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):131-136.

Forty seven patients with locally recurrent uterine cerival cancer after surgery were treated with radiation during the 6 year period from 1979 through 1984 at the Department of Therapeutic Radiology of Seoul National University Hospital. In 30 out of the 47 patients, recurrence was diagnosed within 2 years after surgery. Site of recurrence was vagina in 19 patients, vagina and parametrium in 21 patients and parametrium only in 7 patients. Complete tumor control was achieved in 35 patients (74.5%) ; the complete response rates were 94.7% (18/19( in vaginal recurrences, 57.1% (12/21) in combined vaginal and parametrial recurrences and 71.4% (5/7) in parametrial recurrences. Overall and disease free survival rates at 4 years were 55.2 and 50.1 percent, respectively, for entire group. Overall 4 year survival rates were 77.0% for vaginal recurrences, 44.1% for vaginal and parametrial recurrences and 42.9% for parametrial recurrences. When the disease extent was classified in the same way as the staging system of FIGO, the 4 year survival was 80.4, 73.0, 25.0 and 0 percent for stage lla, llb and IVa, respectively.
Disease-Free Survival ; Humans ; Radiation Oncology ; Radiotherapy* ; Recurrence ; Seoul ; Survival Rate ; Uterine Cervical Neoplasms* ; Vagina

8

Cite

Share

The Studies on the Development of Radiation Pneumonitis and Its Related Factors.

Hyun Suk SUH ; Chung Sik RHEE

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):119-130.

With the introduction of X-rays of higher energy that have higher penetrability, it has become possible to treat the deep-seated tumor with increased local control rate. But at the same time it has incrased the damage to the deep seated organs, especially to the lung which is known to be the less radiotolerable tissue in the body. This study analyses the 66 patients who were exposed to the irradiation of the lung, and examines the development of radiation pneumonitis and its related factors. The results of the study are summarized as folows : 1. The 66 patients were consisted of 40 cases of lung cancer, 15 cases of breast cancer and 11 cases of mediastinal tumors. There were 37 males and 29 females with the male to female ratio 1.3 : 1. A male to female ratio in the lung cancer was 3 : 1. 2. Among 66 patients, 26 patients (39%) developed the radiographical changes of acute radiation pneumonitis and 13 out of 26 patients (50%) showed the clinical features of acute radiation pneumonitis. 3. The onest of acute radiation pneumonitis ranged from 10 days to 6 months after the completion of radiotherapy. 4. There was a statistically significant close relationship between the development of radiation pneumonitis and the radiation dose. 5. As the irradiated lung volume increased, the development of radiation pneumonitis increased. But the statistical significance was not strong. 6. The increased incidence of radiation pneumonitis was observed when the chemotherapy was given before or concomittantly with radiotherapy. 7. There was no significant correlation between the development of radiation pneumonitis and the age, smoking and the presence of underlying lung disease.
Breast Neoplasms ; Drug Therapy ; Female ; Humans ; Incidence ; Lung ; Lung Diseases ; Lung Neoplasms ; Male ; Radiation Pneumonitis* ; Radiotherapy ; Smoke ; Smoking

9

Cite

Share

Esophageal Steno-Obstruction due to Nonesophageal Tumors.

Yoon Kyeong OH ; Hak Jun GIL ; Soo Mi CHUNG ; Sei Chul YOON ; Kyung Sub SHINN ; Yong Whee BAHK

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):111-118.

From March, 1983 to March, 1987, 16 patients with esophageal steno-obstruction due to nonesophageal tumors were treated in the Division of Therapeutic Radiology, Kangnam St. Mary's Hospital, Catholic University Medical College. The patient characteristics, effect of radiotherapy (XRT) on esophageal steno-obstruction and survival were evaluated. The most common primary tumor was lung cancer (14/16) and the middle third of the esophagus was most frequently involved (14/16). Improved clinical response was observed in 80% of the patients who finished the planned courses of XRT. The mean radiation dose evoking the improvement of dysphagia was 2,993 cGy given over a period of 3 to 4 weeks. The Kaplan-Meier estimates of survival at 15 and 30 weeks of follow-up were 60% and 46%, respectively. In the completed group who finished the whole planned courses of XRT, survival rates were 77% and 51%, respectively. Four patients were alive over 90 weeks with normal passage of food.
Deglutition Disorders ; Esophagus ; Follow-Up Studies ; Humans ; Lung Neoplasms ; Radiation Oncology ; Radiotherapy ; Survival Rate

10

Cite

Share

Clinical and Therapeutic Aspects of Squamous Cell Carcinoma of Oral Tongue.

Samuel RYU ; Chang Gul LEE ; In Kyu PARK ; Chang Ok SUH ; Gwi Eon KIM ; John J K LOH

Journal of the Korean Society for Therapeutic Radiology.1987;5(2):105-110.

Fourty nine patients with squamous cell carcinoma of oral tongue were reviewed retrospectively for the evaluation of clinical manifestation and for the comparison between therapeutic modalites. The gross shape of the tumor was infiltrative in 22, ulcerative in 12, and ulceroinfiltrative type in 10 patients. Direct extension of the tumor was most commonly to the floor of the mouth. The incidence of nodal metastasis generally increased with tumor stage. 55% of the patients showed neck nodal metastasis at the time of diagnosis. Ipsilateral subdigastric node were most commonly involved, followed by submandibular nodes. The 5-year survival rate of patients treated with surgery and radiotherapy was 58.7% in contrast to 21.6% in radiation alone group. Overall 5-year survival rate was 31%. In radiation alone group, half of the patients in stage I, II were locally controlled. But the local control in stage III, IV was much inferior to early lesions. Especially, of 4 patients combined with implantation tecnhnique, 3 were completely controlled. 5-year survival rate of these implanted patients was 50%, 49.4% of patients treated over 7,000 cGy survived 5 years. This was significant in contrast to 6.4% of the group treated below 7,000 cGy. The most common sites of failures were primary sites. In early lesions primary radiotherapy with implantation would be an appropriate treatment in cancer of oral tongue, operation reserved for radiation failure. Operation and adjuvant radiotherapy is recommended in cases of advanced disease.
Carcinoma, Squamous Cell* ; Diagnosis ; Humans ; Incidence ; Mouth ; Neck ; Neoplasm Metastasis ; Radiotherapy ; Radiotherapy, Adjuvant ; Retrospective Studies ; Survival Rate ; Tongue* ; Ulcer

DISPLAY OPTIONS

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share

Cite

Share