• Title, Summary, Keyword: Immobilization Device

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Evaluation of Usefulness in New Immobilization Device with 3D CT Angiography for Lower Extremity (전산화단층촬영검사에서 하지의 3D 혈관조영검사를 위한 새로운 고정기구의 유용성 평가)

  • Jang, Keun-Jo;Kweon, Dae-Cheol
    • The Journal of the Korea Contents Association
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    • v.7 no.4
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    • pp.184-191
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    • 2007
  • Our objective was to develop and evaluate a non-invasive device for rigid immobilization and surface disease non-contact of the table in the lower extremity during CT angiography. The immobilization device consists of two components. The patient's lower limb device stabilizing elements made of polyethylene resin soft materials, and pelvis parts foam pad is used for non-contact surface. In a Prospective study the lower extremity device was used in patients who underwent a CT angiography of the lower limb. Immobilization with our device was well tolerated by all patients. The quality of the resulting images in the popliteal and infrapopliteal region was rated by five-point scale. The rigid immobilization resulted in a complete absence of motion artifacts. The new device is an effective, well tolerated and easily used immobilization that is suitable of use in 3D lower extremity CT angiography.

The evaluation for usefulness of the custom made immobilization device for the anteroperitoneal resection patients with rectal cancer (복 회음부 절제술 환자를 위한 고정용구 제작 및 유용성 평가)

  • Yang Oh Nam;Lee Woo Seok;Hong Tack Kyun;Jo Young Pil;Yun Hwa Ryong;Kim Jung Man
    • The Journal of Korean Society for Radiation Therapy
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    • v.15 no.1
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    • pp.61-65
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    • 2003
  • I. Purpose Patient immobilization is essential factor for successful radiation therapy and major problem is reproducibility to maintain patient position during total radiation therapy period. Purpose of this study is evaluation for usefulness of the custom made immobilization device for the anteroperitoneal resection patients with rectal cancer II. Materials and Methods The object of this study were patients who underwent anteroperitoneal resection and undergo radiation therapy at present with rectal cancer. We made immobilization device for patient individually and analyzed its set up reproducibility, patient position deviation and errors. III. Results There was $5mm{\sim}10mm$ deviation in patient position without individual immobilization device, but we improved the deviation within few mm limitation with individual immobilization device. IV. Conclusion Custom made immobilization device was very helpful for anteroperitoneal resection patient with rectal cancer. We improved the patient position deviation within few mm limitation, shorten the set up time and we could give the comfort to patients.

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The error analysis of field size variation in pelvis region by using immobilization device (고정기구의 사용이 골반부위 방사선조사영역의 변화에 미치는 오차분석)

  • Kim, Ki-Hwan;Kang, No-Hyun;Bim, Dong-Wuk;Kim, Jun-Sang;Jang, Ji-Young;Kim, Yong-Eun;Kim, Jae-Sung;Cho, Moon-June
    • Journal of Radiation Protection and Research
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    • v.25 no.1
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    • pp.31-36
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    • 2000
  • In radiotherapy, it may happen to radiate surrounding normal tissue because of inconsistent field size by changing patient position during treatment. We are going to analyze errors reduced by using immobilization device with Electonic portal imaging device(EPID) in this study. We had treated the twenty-one patients in pelvic region with 10 MV X-ray from Aug. 1998 to Aug. 1999 at Chungnam National University Hospital. All patients were treated at supine position during treatment. They were separated to two groups, 11 patients without device and 10 patients with immobilization device. We used styrofoam for immobilization device and measured the errors of anterior direction for x, y axis and lateral direction for z, y axis from simulation film to EPID image using matching technique. For no immobilization device group, the mean deviation values of x axis and y axis are 0.19 mm. 0.48 mm, respectively and the standard deviations of systematic deviation are 2.38 mm, 2.19 mm, respectively and of random deviation for x axis and y axis are 1.92 mm. 1.29 mm, respectively. The mean deviation values of z axis and y axis are -3.61 mm. 2.07 mm, respectively and the standard deviations of systematic deviation are 3.20 mm, 2.29 mm, respectively and of random deviation for z axis and y axis are 2.73 mm. 1.62 mm, respectively. For immobilization device group, the mean deviation values of x axis and y axis are 0.71 mm. -1.07 mm, respectively and the standard deviations of systematic deviation are 1.80 mm, 2.26 mm, respectively and of random deviation for x axis and y axis are 1.56 mm. 1.27 mm, respectively. The mean deviation values of z axis and y axis are -1.76 mm. 1.08 mm, respectively and the standard deviations of systematic deviation are 1.87 mm, 2.83 mm, respectively and of random deviation for x axis and y axis are 1.68 mm, 1.65 mm, respectively. Because of reducing random and systematic error using immobilization device, we had obtained good reproducibility of patient setup during treatment so that we recommend the use of immobilization device in pelvic region of radiation treatment.

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Abdomen Immobilization with Air Injected Balloon Blanket

  • Suh, Ye-Lin;Yi, Byong-Yong;Ahn, Seung-Do;Lee, Sang-Wook;Kim, Jong-Hoon;Shin, Seung-Ai;Park, Eun-Kyung
    • Proceedings of the Korean Society of Medical Physics Conference
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    • pp.100-102
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    • 2002
  • The demand for a better immobilization device has been increased in the radiation oncology field. Especially, it is essential to have a reliable and practical immobilization tool for the whole body radiosurgery and the IMRT (intensity modulated radiation therapy). A useful method to immobilize the abdomen for the external beam radiation treatment is developed. The air-injected balloon blanket (AIBB) was designed as an immobilization device. As the air was injected into it, it pressed down the patient's abdomen and fixed the patient. The AIBB played a role not only to grab the patients' motion, but also to increase the patients' setup reproducibility. Patients' movements due to the respiration were reduced and the reconstruction could be maximized. The experimental results revealed that the AIBB could be used for the clinic.

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Feasibility Study of Robotics-based Patient Immobilization Device for Real-time Motion Compensation

  • Chung, Hyekyun;Cho, Seungryong;Cho, Byungchul
    • Progress in Medical Physics
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    • v.27 no.3
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    • pp.117-124
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    • 2016
  • Intrafractional motion of patients, such as respiratory motion during radiation treatment, is an important issue in image-guided radiotherapy. The accuracy of the radiation treatment decreases as the motion range increases. We developed a control system for a robotic patient immobilization system that enables to reduce the range of tumor motion by compensating the tumor motion. Fusion technology, combining robotics and mechatronics, was developed and applied in this study. First, a small-sized prototype was established for use with an industrial miniature robot. The patient immobilization system consisted of an optical tracking system, a robotic couch, a robot controller, and a control program for managing the system components. A multi speed and position control mechanism with three degrees of freedom was designed. The parameters for operating the control system, such as the coordinate transformation parameters and calibration parameters, were measured and evaluated for a prototype device. After developing the control system using the prototype device, a feasibility test on a full-scale patient immobilization system was performed, using a large industrial robot and couch. The performances of both the prototype device and the realistic device were evaluated using a respiratory motion phantom, for several patterns of respiratory motion. For all patterns of motion, the root mean squared error of the corresponding detected motion trajectories were reduced by more than 40%. The proposed system improves the accuracy of the radiation dose delivered to the target and reduces the unwanted irradiation of normal tissue.

A Temperature-Controllable Microelectrode and Its Application to Protein Immobilization

  • Lee, Dae-Sik;Choi, Hyoung-Gil;Chung, Kwang-Hyo;Lee, Bun-Yeoul;Pyo, Hyeon-Bong;Yoon, Hyun-C.
    • ETRI Journal
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    • v.29 no.5
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    • pp.667-669
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    • 2007
  • This letter presents a smart integrated microfluidic device which can be applied to actively immobilize proteins on demand. The active component in the device is a temperature-controllable microelectrode array with a smart polymer film, poly(N-isopropylacrylamide) (PNIPAAm) which can be thermally switched between hydrophilic and hydrophobic states. It is integrated into a micro hot diaphragm having an integrated micro heater and temperature sensors on a 2-micrometer-thick silicon oxide/silicon nitride/silicon oxide (O/N/O) template. Only 36 mW is required to heat the large template area of 2 mm${\times}$16 mm to $40^{\circ}C$ within 1 second. To relay the stimulus-response activity to the microelectrode surface, the interface is modified with a smart polymer. For a model biomolecular affinity test, an anti-6-(2, 4-dinitrophenyl) aminohexanoic acid (DNP) antibody protein immobilization on the microelectrodes is demonstrated by fluorescence patterns.

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A Feasibility Study on the Abdomen Immobilization with Air Injected Balloon Blanket (공기 주입형 풍선 담요를 이용한 복부 고정 가능성 연구)

  • 서예린;안승도;이상욱;김종훈;신승애;최은경;서태석;이병용
    • Progress in Medical Physics
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    • v.13 no.3
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    • pp.176-180
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    • 2002
  • The demand for a better immobilization device has been increased in the radiation oncology field. Especially, it is essential to have a reliable and practical immobilization tool for the whole body radio-surgery and the IMRT(intensity modulated radiation therapy). A new method to immobilize the abdomen for the external beam radiation treatment was developed. The air-injected balloon blanket (AIBB) was designed as an immobilization device. As the air was injected into the AIBB, it pressed down the patient's abdomen and fixed the patient. The AIBB played a useful role to grab the patients' motion. Displacement of the abdomen in the anterior-posterior direction, which showed moving most during the respiration, reduced by more than 5 mm. Patients' movements from the breathing were reduced. The experimental results revealed that the AIBB could be used for the clinic.

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The evaluation of usefulness of the newly manufactured immobilization device (치료보조기구의 제작 및 유용성 평가)

  • Seo Seok Jin;Kim Chan Yoeng;Lee Je Hee;Park Heung Deuk
    • The Journal of Korean Society for Radiation Therapy
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    • v.17 no.1
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    • pp.45-55
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    • 2005
  • Purpose : To evaluate the usefulness of the handmade patient immobilization device and to report the clinical results of it. Materials and methods : We made two fusion images and analyzed those images. One image is made with diagnostic MR image and CT image, the other with therapeutic planning MR image and CT image. With open head holder, we measured the skin dose and attenuation dose. Also, we made the planning CT couch plate with acrylic plate and styrofoam and compared artifact. Results : We could get more accurate fusion image when we use MR head holder(within 2mm error). The skin dose was reduced 2 times and the attenuation dose was reduced more than $20\%$ when open head holder used. The planning CT couch plate was more convenient than conventional board and reduced artifact remarkably. Conclusion : We could verify the localization point in the MR image which is taken with MR head holder. So we could fuse the image more accurately. The same method could be applied to PET and US image, if the alike immobilization device used. With open head holder, the skin dose and the attenuation dose was reduced. And those above devices could substitute for expensive foreign device, if those are manufactured adequately.

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DNA Selective Immobilization on a Microcantilever with Nano-Interdigitated Electrodes (Nano-IDEs) Using Cyclic Voltammetry (맞물린 나노전극을 가지는 마이크로 캔틸레버의 제작 및 순환전압전류방법을 이용한 DNA의 선택적인 고정화)

  • Lee, Jung-A;Lee, Kwang-Cheol
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.6
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    • pp.459-464
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    • 2008
  • We present a novel microcantilever device with nano-interdigitated electrodes (nano-IDEs) and DNA selective immobilization on the nano-IDEs for biosensing applications. Using the nano-IDEs and cyclic voltammetric methods, we have achieved selective immobilization of DNA with submicrometer spatial resolution on a freestanding microcantilever. $70{\sim}500\;nm$-wide gold (Au) nano-IDEs are fabricated on a low-stress SiNx microcantilever with dimensions of $100{\sim}600\;{\mu}m$ in length, and $15{\sim}60\;{\mu}m$ in width, with a $0.5\;{\mu}m$ thickness using electron beam lithography and bulk micromachining. Streptavidin is selectively deposited on one side of the nano-IDEs using cyclic voltammetry at a scan rate of 0.1 V/s with a range of $-0.2{\sim}0.7\;V$ during $1{\sim}5$ cycles. The selective deposition of dsDNA is confirmed by fluorescence microscopy after labeling with YOYO-1 dye.

Comparison of Two Different Immobilization Devices for Pelvic Region Radiotherapy in Tomotherapy

  • Kim, Dae Gun;Jung, James J;Cho, Kwang Hwan;Ryu, Mi Ryeong;Moon, Seong Kwon;Bae, Sun Hyun;Ahn, Jae Ouk;Jung, Jae Hong
    • Progress in Medical Physics
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    • v.27 no.4
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    • pp.250-257
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    • 2016
  • The purpose of this study was to compare the patient setup errors of two different immobilization devices (Feet Fix: FF and Leg Fix: LF) for pelvic region radiotherapy in Tomotherapy. Thirty six-patients previously treated with IMRT technique were selected, and divided into two groups based on applied immobilization devices (FF versus LF). We performed a retrospective clinical analysis including the mean, systematic, random variation, 3D-error, and calculated the planning target volume (PTV) margin. In addition, a rotational error (angles, $^{\circ}$) for each patient was analyzed using the automatic image registration. The 3D-errors for the FF and the LF groups were 3.70 mm and 4.26 mm, respectively; the LF group value was 15.1% higher than in the FF group. The treatment margin in the ML, SI, and AP directions were 5.23 mm (6.08 mm), 4.64 mm (6.29 mm), 5.83 mm (8.69 mm) in the FF group (and the LF group), respectively, that the FF group was lower than in the LF group. The percentage in treatment fractions for the FF group (ant the LF group) in greater than 5 mm at ML, SI, and AP direction was 1.7% (3.6%), 3.3% (10.7%), and 5.0% (16.1%), respectively. Two different immobilization devices were affected the patient setup errors due to different fixed location in low extremity. The radiotherapy for the pelvic region by Tomotherapy should be considering variation for the rotational angles including Yaw and Pitch direction that incorrect setup error during the treatment. In addition the choice of an appropriate immobilization device is important because an unalterable rotation angle affects the setup error.