P Haraldsson | Search PubMed

PubMed2000

Dose response characteristics and basic dose distribution data for a polymerization-based dosemeter gel evaluated using MR.

A safe and reproducible mixing procedure for the manufacture of a polymerization-based dosemeter gel evaluated using MRI (PoMRI) is presented. The dose response, obtained by irradiating gel-filled vials with absorbed doses in the interval 0-20 Gy and evaluated with respect to 1/T2, was found to be linear in the interval 0-8 Gy, with a sensitivity of 0.211 s-1Gy-1 (r2 = 0.998) at 1.5 T. Evaluation of the same set of vials with respect to 1/T1 gave a sensitivity of 0.018 s-1Gy-1 (r2 = 0.960). PoMRI and diode data were compared for standard photon and electron treatment beams. A deviation of less than 3% was found between the two methods for central depth dose curves as well as dose profiles (2 mm for electrons in the steep dose gradient regions). The importance of the method used for background correction for the reliability of the results was also evaluated. Barex (with a wall thickness of 1.5 mm) was investigated for use as phantom material and found to be favourable compared with glass. The results obtained in this study show that PoMRI has excellent potential as a 3D detector.

Dose-Response Relationship, Radiation↗

PubMedDate not supplied

Psychosocial impact of cosmetic rhinoplasty.

The psychosocial impact of cosmetic rhinoplasty in Scandinavia is poorly investigated. Therefore a study was undertaken utilizing a mailed audit covering self-percepted experiences before, during, and after surgery. A total of 67 of 80 patients responded to the questionnaire (84%), on average 18 months after surgery. The mean age was 31 years (range, 16-63 years) and the M/F ratio was 20/44 among the 64 patients analyzed, half of whom were of foreign extraction. The self-report disclosed that a majority of the patients had been preoccupied with their noses since puberty and that the mental awareness of nasal stigmatization was given mainly by the mirror (58%), not by others. Despite the early exclusion of patients with possible body dysmorphic disorder, almost one-fourth had a severe complex, and one-third felt socially inhibited by their noses and avoided being looked at from certain angles. Surgery was not a significant problem even though it was performed under local anesthesia and i.v. sedation. The great majority (91%) were satisfied with the result and 89% would recommend the procedure to others. More than 60% felt more self-confident and perceived life as being easier. To conclude, successful rhinoplasty may change preoccupied patients' lives, because the majority simply stopped thinking about their noses.

Adolescent↗