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This paper analyzes differences in welfare utilization between immigrants and natives in Sweden using a large panel data set for the years 1990 to 1996. We find that immigrants use welfare to a greater extent than natives and that differences cannot be explained by observable characteristics. Welfare participation decreases with time spent in Sweden.(More)
A Phase I-II trial testing the addition of systemic cisplatin (CDDP) to local hyperthermia and radiation was conducted to determine the dose of cisplatin that is tolerable once weekly for 6 weeks and to estimate the therapeutic potential of this trimodality combination in patients with locally advanced malignancies. Cisplatin at 20 mg/m2 (4 patients), 30(More)
This paper describes the design of a novel ultrasonic therapy system dedicated to the breast cancer treatment and the theoretical investigation of the heating characteristics of the system. The applicator is a cylinder comprised of a stack of rings. Each ring has up to 48 transducers mounted on the inside of the ring and directed towards the centre. The(More)
PURPOSE This report presents an update to the American Brachytherapy Society (ABS) high-dose-rate (HDR) brachytherapy guidelines for locally advanced cervical cancer. METHODS Members of the ABS with expertise in cervical cancer formulated updated guidelines for HDR brachytherapy using tandem and ring, ovoids, cylinder, or interstitial applicators for(More)
Dose distributions produced by small circular beams of 6 MV x-rays have been measured using ionisation chambers of small active volume. Specific quantities measured include tissue maximum ratios (TMR), total scatter correction factors (St), collimator scatter correction factors (Sc) and off-axis ratios (OAR). Field sizes ranged from 12.5 to 30 mm diameter,(More)
We have recently initiated a program for irradiating small, unresectable arteriovenous malformations (AVM's) in the brain. The treatments are delivered using a modified and carefully calibrated 6 MV linac. We are using high, single doses (15 to 25 Gy) with a goal of sclerosing the vessels and preventing hemorrhages. This technique, radiosurgery, is somewhat(More)
* This paper has been largely influenced by several discussions I have had with Zvi Eckstein. I thank him for many ideas and suggestions. Comments from three anonymous referees were very useful in preparing the last version of the paper. Discussions with and Uwe Sunde provided useful comments at various stages of the preparation of the manuscript. I thank(More)
PURPOSE To investigate the use of a system using electromagnetic tracking (EMT), post-processing and an error-detection algorithm for detecting errors and resolving uncertainties in high-dose-rate brachytherapy catheter digitization for treatment planning. METHODS EMT was used to localize 15 catheters inserted into a phantom using a stepwise acquisition(More)
BACKGROUND The authors present long-term results from a phase 2 study that assessed the efficacy of transrectal ultrasound hyperthermia plus radiation with or without androgen suppression for the treatment of locally advanced prostate cancer. METHODS Patients with clinical T2b-T3bN0M0 disease (according to 1992 American Joint Committee on Cancer [AJCC](More)