• Proceedings of the Korean Nuclear Society Conference
• /
• 2004.10a
• /
• pp.1206-1207
• /
• 2004

• Proceedings of the Korean Society of Medical Physics Conference
• /
• 1999.11a
• /
• pp.88-89
• /
• 1999

• Radiation Oncology Journal
• /
• v.1 no.1
• /
• pp.79-83
• /
• 1983

• Radiation Oncology Journal
• /
• v.3 no.1
• /
• pp.69-73
• /
• 1985

• 대한방사선방어학회:학술대회논문집
• /
• 2009.11a
• /
• pp.106-107
• /
• 2009

• Radiation Oncology Journal
• /
• v.36 no.1
• /
• pp.1-10
• /
• 2018

Intensity-modulated radiation therapy (IMRT) has been considered the most successful development in radiation oncology since the introduction of computed tomography into treatment planning that enabled three-dimensional conformal radiotherapy in 1980s. More than three decades have passed since the concept of inverse planning was first introduced in 1982, and IMRT has become the most important and common modality in radiation therapy. This review will present developments in inverse IMRT treatment planning and IMRT delivery using multileaf collimators, along with the associated key concepts. Other relevant issues and future perspectives are also presented.

• 대한두경부종양학회:학술대회논문집
• /
• 2008.11a
• /
• pp.277-277
• /
• 2008

• 대한두경부종양학회:학술대회논문집
• /
• 2007.11a
• /
• pp.215-215
• /
• 2007

• Progress in Medical Physics
• /
• v.30 no.4
• /
• pp.155-159
• /
• 2019

Radiological properties of newly introduced and existing 3-dimensional (3D) printing materials were evaluated by measuring their Hounsfield units (HUs) at varying infill densities. The six materials for 3D printing which consisted of acrylonitrile butadiene styrene (ABS), a unique ABS plastic blend manufactured by Zortrax (ULTRAT), high impact polystyrene (HIPS), polyethylene terephthalate glycol (PETG), polylactic acid (PLA), and a thermoplastic polyester elastomer manufactured by Zortrax (FLEX) were used. We used computed tomography (CT) imaging to determine the HU values of each material, and thus assess its suitability for various applications in radiation oncology. We found that several material and infill density combinations resembled the HU values of fat, soft tissues, and lungs; however, none of the tested materials exhibited HU values similar to that of bone. These results will help researchers and clinicians develop more appropriate instruments for improving the quality of radiation therapy. Using optimized infill densities will help improve the quality of radiation therapy by producing customized instruments for each field of radiation therapy.

• Journal of Gastric Cancer
• /
• v.14 no.3
• /
• pp.207-210
• /
• 2014

The peritoneum is the most frequent site of recurrence for gastric cancer after gastrectomy, followed by the liver and lymph nodes. In contrast, metastasis to the thymus is rare. Annual surveillance with computed tomography was performed on a 67-year-old man who previously underwent a distal gastrectomy and D2 lymph node dissection for gastric cancer at Tottori University. Five years after the initial operation, an anterior mediastinal tumor was detected by computed tomography. The patient underwent video-assisted thoracic surgery to remove the tumor. Histopathology revealed adenocarcinoma cells similar to those of the gastric cancer resected 5 years previously. Thymic metastasis was considered likely based on the location of the tumor. The recognition that gastric cancer can metastasize to unusual anatomic locations, such as the thymus, can facilitate an accurate, prompt diagnosis and appropriate treatment.