Why Do We Not Need CT in Patients Who Undergo Type I Tympanoplasty?

Objective:High-resolution computed tomography (HRCT) has gained wide acceptance in diagnostic work-up of suppurative chronic otitis media. Most ear surgeons order HRCT to make a rational operative plan, especially in the presence of symptoms, such as refractory otorrhea with bad odor, epithelial debris at retraction pockets, and defects in bony walls of the middle ear. The aim of this study was to show the lack of necessity of preoperative HRCT by evaluating its predictive value in patients who underwent type I tympanoplasty.Methods:The study included a patient group who underwent tympanoplasty with dry perforation and normal middle ear mucosa. The intraoperative findings of 43 patients were compared with preoperative HRCT and audiogram findings.Results:There was no significance between preoperative air conduction threshold and existence of ossicular erosion in HRCT. HRCT incorrectly predicted the presence of cholesteatoma in two patients. The positive predictive value of HRCT in detecting soft or granulation tissue was 4/14 (28.57%). The sensitivity and specificity of HRCT in the diagnosis of ossicular chain status were 9.09% and 90.62%, respectively.Conclusion:HRCT plays an important role in the assessment of patients with suppurative chronic otitis media and cholesteatoma. However, preoperative HRCT in patients who have undergone type I tympanoplasty is not necessary. It has no benefit and also leads patients to unnecessary radiation exposure

A quantum pseudodot system with two-dimensional pseudoharmonic potential under external magnetic and AB flux fields

Using the Nikiforov-Uvarov (NU) method, the energy levels and the wave functions of an electron confined in a two-dimensional (2D) pseudoharmonic quantum dot are calculated under the influence of temperature and an external magnetic field inside dot and Aharonov-Bohm (AB) field inside a pseudodot. magnetic field and geometrical size of quantum pseudodot. The temperature dependence energy levels for GaAs semiconductor are also calculated. The exact solutions for energy eigenvalues and wave functions are computed as functions of the chemical potential parameters, applied magnetic field strength, AB flux field, magnetic quantum number and temperature. Analytical expression for the light interband absorption coefficient and absorption threshold frequency are found as functions of appliedComment: 20 pages, 8 figures; Physica B: Condensed Matter (2012) (at press). arXiv admin note: substantial text overlap with arXiv:1111.244