Nathan Licht

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PURPOSE 18F-deoxyglucose positron emission tomography (FDG-PET) is increasingly applied in the staging of lung cancer (LC). This study analyzes the potential contribution of PET in radiotherapy planning for LC with special respect to tumor-associated atelectasis. METHODS AND MATERIALS Thirty-four patients with histologically confirmed LC, who had been(More)
Immunofluorescence was used to characterize the lymphocyte subpopulations of mice treated with six immunomodulatory drugs: hydrocortisone acetate (HCA), corticosterone acetate (corticosterone), cyclophosphamide, cytosine arabinoside (Ara-C), 15(S)-methyl prostaglandin E1 (15(S)-methyl PGE1), and 2-amino-5-bromo-6-phenyl-4-(3H)-pyrimidinone (ABPP). The(More)
Five male cadavers were used to evaluate anatomically structures at risk using sacral pedicle screw fixation. Risk was defined as the likelihood of penetration by K-wires placed through the pedicles and cortices at the S1, S2, and S3 levels. A scale based on the distance from the wire to the vital structure was developed to quantify risk. Instrument(More)
AIM In recent years, FDG-PET examinations have become more important for problems in oncology, especially in staging of bronchogenic carcinoma. In the retrospective study presented here, the influence of PET on the planning of radiotherapy for patients with non-small-cell lung cancer (NSCLC) was investigated. METHODS The study involved 39 patients with(More)
OBJECTIVE Identify challenges that people from complex families may encounter when using traditional consumer family health history (FHH) applications and examine assumptions on which the applications are based. METHOD Scenario-based testing was employed in which three evaluators used a consumer FHH application guided by four scenarios, recording the(More)
Continuous depth dose measurements are generally performed in water phantoms. It is now possible to make continuous depth dose measurements in the solid PMMA phantom Plexitom, developed by our group and manufactured by PTW. The mechanical construction of this phantom allows the continuous movement of the ionisation chamber within the solid phantom. The(More)
PURPOSE A computerized dosimetry system for calibration of the dose monitor of a medical accelerator was developed with the aim of saving time and reducing errors during measurement and analysis of measured data. METHOD The PC-based part of the programme system controls measurements with dosimeters of type Dosimentor using an interface IF4. After(More)
The operation of an accelerator requires to perform at regular intervals a control measurement of the basic calibration. This measurement showed a deviation growing from week to week. Finally, the test measurements gave occasion to suppose a defect of the used ionizing chamber, but this was not confirmed by measurements at a gamma irradiation unit. When the(More)
A mantle field is localized according to the patient's data in an inhomogenous Alderson phantom. After having established the irradiation scheme, the dose distributions measured in the Alderson phantom are compared with those measured and calculated in an homogenous water phantom. The possible side effects of this irradiation technique can be assessed on(More)
We have used spin labeling, fluorescence polarization, and chemical analysis to characterize membrane properties of thymocytes from mice treated with immunomodulatory drugs. The number of thymocytes was reduced 90-95% by treatment of 6-9 week old mice with hydrocortisone acetate (HCA) or methylprednisolone (both 125 mg/kg) or with cyclophosphamide (250(More)
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