Reconstruction Formula for Photoacoustic Tomography with Cylindrical Detectors

Photoacoustic tomography, the well-known example of a hybrid imaging method, is a biomedical imaging modality based on the photoacoustic effect. Assuming cylindrical-shaped detectors are used to record the acoustical data for the photoacoustic tomography, we propose a new Radon-type transform to reconstruct the initial density function. The reconstruction of the suggested Radon-type transform is based on the properties of Bessel functions and Fourier-Bessel series expansion. Numerical simulation results are presented to demonstrate our proposed algorithm. © 2017 Springer Science+Business Media New Yorope

Recurrent inguinal hernia: randomized multicenter trial comparing laparoscopic and Lichtenstein repair

Background: The optimal treatment for recurrent inguinal hernia is of concern due to the high frequency of recurrence. Methods: This randomized multicenter study compared the short- and long-term results for recurrent inguinal hernia repair by either the laparoscopic transabdominal preperitoneal patch (TAPP) procedure or the Lichtenstein technique. Results: A total of 147 patients underwent surgery (73 TAPP and 74 Lichtenstein). The operating time was 65 min (range, 23-165 min) for the TAPP group and 64 min (range, 25-135 min) for the Lichtenstein group. Patients who underwent TAPP reported significantly less postoperative pain and shorter sick leave (8 vs 16 days). The recurrence rate 5 years after surgery was 19% for the TAPP group and 18% for the Lichtenstein group. Conclusion: The short-term advantage for patients who undergo the laparoscopic technique is less postoperative pain and shorter sick leave. In the long term, no differences were observed in the chronic pain or recurrence rate