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The purpose of this study is to evaluate the dosimetric impact of the margin on the multileaf collimator-based dynamic tumor tracking plan. Furthermore, an equivalent setup margin (EM) of the tracking plan was determined according to the gated plan. A 4-dimensional extended cardiac-torso was used to create 9 digital phantom datasets of different tumor diameters (TDs) of 1, 3, and 5 cm and motion ranges...
Posterior cruciate ligament (PCL) is important for the knee stability. The problem seems to lie in the fact that it is difficult to segment the PCL from a magnetic resonance (MR) image. To reduce massive measurement time and subjective judgment error, this paper proposes a segmentation method of the PCL in knee joint from MR image and computed tomography (CT) image using anatomical information. In...
Total knee arthroplasty (TKA) is an effective surgical treatment for the knee osteoarthritis, and is currently performed about 50,000 per year in Japan. TAK minimally invasive surgery (TKA-MIS) is a smaller incision range than TKA, and can expect an early recovery and post-surgical pain reduction. The navigation system for the purpose of precision improvement and shortening of the operative time operated...
EndoButton is a fixation device which is attached to an end point of the bone tunnel in the anterior cruciate ligament (ACL) reconstruction. Displacement of the EndoButton affects the clinical outcome. Analysis of the EndoButton displacement can support to avoid the misplacement. This study set the goal to propose an analysis of EndoButton attitude after anterior cruciate ligament reconstruction (ACL)...
There is the tibial eminence at the tibial plateau which often fractures in early age. Medical doctors subjectively diagnose the injury with multi-detector computed topography (MDCT) image. However, the evaluation results depends on the knowledge and experience. It is important to provide a quantitative criterion to them. A purpose of this study is to propose an automated extraction of the tibial...
Blumensaat line is one of the most commonly used direct methods for the assessment of femoral diagnosis and therapy. Currently, the Blumensaat line is determined manually. Therefore, diversity of the determination happens due to the subjective judgment error. To reduce the diversity, we propose an automated determination of Blumensaat Une by using fuzzy logic based on physician knowledge from femur...
Comparison of anatomical or functional parameters is common theme in the evaluation of unilateral pathologies of the human knee joint, although the degree of bilateral symmetry is unknown. Currently, the evaluation is performed manually. Therefore, diversity of the evaluation happens due to the subjective judgment. To reduce the diversity, we propose an automated analysis method for anatomical knee...
The anterior cruciate ligament (ACL) reconstruction is usually performed for the injured knee. The ACL reconstruction needs two bone tunnels. It is important to measure changing of the bone tunnel regions after surgery. Thus this study aims to propose an automated segmentation about anteromedial (AM) and posterolateral (PL) parts of the bone tunnels after double bundle ACL reconstruction using k-means...
The anterior cruciate ligament (ACL) injury can cause a reason of instability along anterior — posterior translation at extension. Thus, it is important to examine the knee joint quantitatively for understanding clinical outcome. However, an quantitative calculation method of the knee joint has not been reported. Therefore, we have developed six degree of freedom (6 DOF) calculation based on principal...
Anterior cruciate ligament (ACL) reconstruction is making a hole called as bone tunnel to fix a graft to the femur and tibia. A volume change of this bone tunnel enlargement with time affects a knee motion. We have already developed three dimensional analysis method for knee july-row detector computed tomography (MDCT) image. However, the direction of the bone tunnel enlargement was unclear, because...
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