ABSTRACT
BACKGROUND: The intraoral stent is a mouth-opening device which may be used during head and neck cancer radiotherapy with the intention of preventing unnecessary irradiation in normal adjacent tissue. The use of this device during intensity-modulated radiation therapy (IMRT) has not been reported in the literature. METHODS: A 30-year-old woman with squamous cell carcinoma of the tongue was submitted to a CT for IMRT treatment planning with and without the use of the intraoral stent. RESULTS: Dosimetric analysis showed that the irradiation dose to the maxilla, both parotid glands, and left submandibular gland decreased with the use of this device. CONCLUSION: This article shows that intraoral stents seem to be useful in decreasing the radiation dose to healthy structures, especially in bone structures and salivary glands during radiotherapy, and emphasizes the importance of a multidisciplinary team during oncological therapy.
Subject(s)
Carcinoma, Squamous Cell/radiotherapy , Radiation Injuries/prevention & control , Radiotherapy, Intensity-Modulated/methods , Stents , Tongue Neoplasms/radiotherapy , Adult , Carcinoma, Squamous Cell/diagnostic imaging , Dose-Response Relationship, Radiation , Female , Humans , Maxilla/radiation effects , Parotid Gland/radiation effects , Radiation Dosage , Radiotherapy Dosage , Submandibular Gland/radiation effects , Tomography, X-Ray Computed , Tongue Neoplasms/diagnostic imagingABSTRACT
We describe a setup for a deep optical dipole trap or lattice designed for holding atoms at temperatures of a few mK, such as alkaline-Earth atoms which have undergone only regular Doppler cooling. We use an external optical cavity to amplify 3.2 W from a commercial single-frequency laser at 532 nm to 523 W. Powers of a few kW, attainable with low-loss optics or higher input powers, allow larger trap volumes for improved atom transfer from magneto-optical traps. We analyze possibilities for cooling inside the deep trap, the induced Stark shifts for calcium, and a cancellation scheme for the intercombination clock transition using an auxiliary laser.
