Repair of severe composite tissue defects in the lower leg using two different cross-leg free composite tissue flaps.

This article reports 2 cross-leg free composite tissue flaps for repairing the severe composite tissue defects in lower leg without suitable adjacent recipient vasculature for microvascular anastomosis. The osseous myocutaneous flap of ilium and tensor fascia lata pedicled with ascending branch of lateral femoral circumflex vessels and the osseous muscle flap of scapula and latissimus dorsi pedicled with subscapular vessels were performed, respectively, to reconstruct the bone and soft-tissue defects in the lower leg of 2 patients. Both donor vessels were the posterior tibial artery and great saphenous vein from the contralateral lower leg.

Solitary giant hemangioma of the humerus.

Osseous hemangiomas are mainly seen in the skull or spine and rarely occur in other bones. They are small lesions usually localized in the metaphyseal and diaphyseal regions. This article describes a rare case of a giant intraosseous hemangioma occupying nearly the whole humerus for 28 years.

[Anatomic study and clinical application of sural neuro-myocutaneous compound flap transposition].

Objective: To investigate the anatomical study and clinical applications of sural neuron-myocutaneous flap transposition for repairing the special patients with soft tissue defect in foot and ankle.

Methods: The branches, distributions and anastomoses of the vessels and nerves lie in superficial layer of the posterior crural region were observed on 30 sides of adult cadaver lower limb specimens perfused with red latex. Since February 2004, distally based sural neuron-myocutaneous flap was applied for repairing 7 cases of soft tissue defect in foot and ankle.

Patient positioning error measurement based on dynamic template matching techniques.

The decrease of accuracy in patients' repeated positioning in radiotherapy due to body's transformation is considered and a positioning error measurement method using dynamic template matching technique is brought forward in this paper. This method is an improvement of the matching method to correct positioning error based on the CT digitally reconstructed radiograph(DRR), which uses the video reconstructed 3D surface model that can reflect the body's transformation as the matching template instead of DRR. This method can not only improve the positioning accuracy but also eliminate the adverse influence brought by body's transformation.

Effect of CT Image-Based Voxel Size On Monte Carlo Dose Calculation.

Currently, the conventional empirical or semi-empirical dose calculation algorithms for radiation treatment planning system have been selected as dose engines. The accuracy of these dose calculation algorithms is limited. The main problem is that they fail to adequately consider the lateral transport of radiation or loss of electronic equilibrium near interface between two heterogeneous mediums.

Repeated positioning in accurate radiotherapy based on virtual net technique and contrary reconstruction scheme.

This paper presents a new repeated positioning system for external radiotherapy. A new scheme is proposed to rebuild patient's body surface 3-D image based on simple stereo vision model and virtual net technique, which improves the reconstruction precision of the template. For the calculation of the positioning error, the contrary reconstruction scheme is adopted and the positioning speed is greatly improved.