• Progress in Medical Physics
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• v.28 no.4
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• pp.144-148
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• 2017

When a high density metallic implant is placed in the path of the proton beam, spatial heterogeneity can be caused due to artifacts in three dimensional (3D) computed tomography (CT) scans. These artifacts result in range uncertainty in dose calculation in treatment planning system (TPS). And this uncertainty may cause significant underdosing to the target volume or overdosing to normal tissue beyond the target. In clinical cases, metal implants must be placed in the beam path in order to preserve organ at risk (OARs) and increase target coverage for tumors. So we should introduce Ti-mesh. In this paper, we measured the lateral dose profile for proton beam using an EBT3 film to confirm dosimetric impact of Ti-mesh when the Ti-mesh plate was placed in the proton beam pathway. The effect of Ti-mesh on the proton beam was investigated by comparing the lateral dose profile calculated from TPS with the film-measured value under the same conditions.

• Journal of Biomedical Engineering Research
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• v.26 no.5
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• pp.337-341
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• 2005

Blood pulsation has been reported to have an advantageous effect on extracorporeal blood circulation. However, the study of pulsatile blood flow in renal replacement therapy is very limited. The in-vitro experimental results of pulsatile blood flow on ultrafiltration, when compared with the conventional roller pump, are described in this paper. Methods: Blood flow rate (QB) and transmembrane pressure (TMP) were considered as regulating factors that have an influence on ultrafiltration. Experiments were performed under the condition of equal TMP and OB in both pulsatile and roller pump groups, Several kinds of hollow fiber dialyzers were tested using distilled water containing chemicals as a blood substitute. Mean TMP (mTMP) varied from 10 to 90mmHg while the QB was 200ml/min. Results: Ultrafiltration rate (QUF) was found to be linearly proportional to TMP, whereas QB had little influence on QUF. In addition, QUF was higher in the pulsatile group than the roller pump group at the identical TMP. Conclusion: In the controlled test, QUF increased solely as a consequence of blood pulsation, which implies that the pulse frequency represents an additional and important clinical variable during renal replacement therapy.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.11a
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• pp.137-137
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• 2005

• 대한생식의학회:학술대회논문집
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• 2004.11a
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• pp.95-95
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• 2004

• 대한예방의학회:학술대회논문집
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• 2005.10a
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• pp.315-315
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• 2005

• Proceedings of the Microbiological Society of Korea Conference
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• 1997.04a
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• pp.67.2-67.2
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• 1997

• Proceedings of the Korean Society of Veterinary Clinics Conference
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• 2006.05a
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• pp.163-163
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• 2006

• Proceedings of the Korean Society of Veterinary Clinics Conference
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• 2008.10a
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• pp.188-188
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• 2008

• Proceedings of the Korean Society of Medical Physics Conference
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• 2006.08a
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• pp.121-121
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• 2006

• 대한핵의학회:학술대회논문집
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• 1988.05a
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• pp.127.1-127.1
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• 1988