scholarly journals EFFECT OF RADIATION DOSE DISTRIBUTION OF THE PROSTATE NEUROVASCULAR BUNDLES ON ERECTILE FUNCTION AND QUALITY OF URINATION IN PATIENTS WITH PROSTATE ADENOCARCINOMA AFTER BRACHYTHERAPY

Author(s):  
A.V. Zyryanov ◽  
R.Y. Kovalenko ◽  
I.V. Borzunov ◽  
D.V. Tevs ◽  
N.A. Onischenko
2020 ◽  
Vol 22 (1) ◽  
pp. 4-13
Author(s):  
Ioannis Mykoniatis ◽  
Koenraad Van Renterghem ◽  
Ioannis Sokolakis

: Our aim is to provide a narrative review regarding the prevalence, the associated pathophysiologic pathways and the potential management methods of sexual dysfunction related to ablative surgical techniques for Benign Prostatic Enlargement (BPE). Men suffering from BPE are at high risk of sexual dysfunction due to the disease itself, comorbidities, and pharmacological/surgical treatments. Transurethral resection of the prostate, as the gold standard treatment option for BPE has historically been associated with relatively high rates of postoperative sexual dysfunction problems, mainly retrograde ejaculation but also erectile dysfunction. Ablative surgical techniques, including photoselective vaporization of the prostate (PVP), transurethral needle ablation (TUNA), Transurethral Microwave Therapy (TUMT), Convective Water Vapor Energy Ablation (Rezum®) and Aquablation® have been proposed as treatment methods able to reduce treatment-related complications for BPE patients, including adverse effects on erectile and ejaculatory function, without compromising the efficacy rates for BPE. The neurovascular bundles can be damaged during TURP due to posterolateral capsular perforation. Ablative techniques and especially PVP theoretically seems to skip this hazard as the distance created from the necrotic area to the capsule is generally larger compared to the distance induced after TURP . However, indirect thermal injury of erectile nerves, which could be induced also by the majority of available ablative techniques could potentially lead to ED. Two special technical characteristics (physiological saline use for tissue ablation and real time penetration depth control) of Aquablation® could be proved beneficial with regard to the effect of the method on erectile function. In general ablative techniques seems to have minor impact on sexual function. However, low methodological quality characterize the most of the studies included in this review mainly due to the impossibility, in many cases, to perform a blind randomization. Also in many studies did not have erectile and ejaculatory function as primary outcomes limiting that way their statistical power to identify significant variations. Management of sexual dysfunction problems arising from ablative surgeries for BPE treatment could be divided in two levels. Firstly, intraoperatively the avoidance of manipulation of crucial structures regarding ejaculatory (bladder neck or ejaculatory ducts) and erectile function (neurovascular bundles) could possibly decrease the negative effect of these procedures on sexual function. Thus, in this direction, modifications of classic ablative techniques have been proposed resulting in encouraging outcomes regarding postoperative sexual function. Secondly, if EjD and/or ED are established the already known treatment choices should be chosen in order sexual function rehabilitation to be achieved. Thus, regarding ED: PDE5i daily or on demand remain the gold standard first line treatment choice followed by intracaver-nosal alprostadil injections in cases of failure, while penile prosthesis implantation must be kept as final definitive solution when all the other methods have failed. Regarding ejaculation disorders (retrograde ejaculation or anejaculation): medical therapy with a-agonists (pseudoephedrine), sperm retrieval from the urine, bladder neck reconstruction, prostatic massage, electroejaculation, penile vibratory stimulation and surgical sperm retrieval are the available treatment options. Further, high quality studies are required to investigate potential side effects of BPE surgery on sexual function and efficient treatment methods to manage them.


2021 ◽  
Vol 11 (6) ◽  
pp. 2838
Author(s):  
Nikitha Johnsirani Venkatesan ◽  
Dong Ryeol Shin ◽  
Choon Sung Nam

In the pharmaceutical field, early detection of lung nodules is indispensable for increasing patient survival. We can enhance the quality of the medical images by intensifying the radiation dose. High radiation dose provokes cancer, which forces experts to use limited radiation. Using abrupt radiation generates noise in CT scans. We propose an optimal Convolutional Neural Network model in which Gaussian noise is removed for better classification and increased training accuracy. Experimental demonstration on the LUNA16 dataset of size 160 GB shows that our proposed method exhibit superior results. Classification accuracy, specificity, sensitivity, Precision, Recall, F1 measurement, and area under the ROC curve (AUC) of the model performance are taken as evaluation metrics. We conducted a performance comparison of our proposed model on numerous platforms, like Apache Spark, GPU, and CPU, to depreciate the training time without compromising the accuracy percentage. Our results show that Apache Spark, integrated with a deep learning framework, is suitable for parallel training computation with high accuracy.


Author(s):  
Michael Esser ◽  
Sabine Hess ◽  
Matthias Teufel ◽  
Mareen Kraus ◽  
Sven Schneeweiß ◽  
...  

Purpose To analyze possible influencing factors on radiation exposure in pediatric chest CT using different approaches for radiation dose optimization and to determine major indicators for dose development. Materials and Methods In this retrospective study at a clinic with maximum care facilities including pediatric radiology, 1695 chest CT examinations in 768 patients (median age: 10 years; range: 2 days to 17.9 years) were analyzed. Volume CT dose indices, effective dose, size-specific dose estimate, automatic dose modulation (AEC), and high-pitch protocols (pitch ≥ 3.0) were evaluated by univariate analysis. The image quality of low-dose examinations was compared to higher dose protocols by non-inferiority testing. Results Median dose-specific values annually decreased by an average of 12 %. High-pitch mode (n = 414) resulted in lower dose parameters (p < 0.001). In unenhanced CT, AEC delivered higher dose values compared to scans with fixed parameters (p < 0.001). In contrast-enhanced CT, the use of AEC yielded a significantly lower radiation dose only in patients older than 16 years (p = 0.04). In the age group 6 to 15 years, the values were higher (p < 0.001). The diagnostic image quality of low-dose scans was non-inferior to high-dose scans (2.18 vs. 2.14). Conclusion Radiation dose of chest CT was reduced without loss of image quality in the last decade. High-pitch scanning was an independent factor in this context. Dose reduction by AEC was limited and only relevant for patients over 16 years. Key Points Citation Format


1996 ◽  
Vol 23 (2) ◽  
pp. 239-240 ◽  
Author(s):  
Charles A. Kelsey ◽  
Fred A. Mettler ◽  
Lisa M. Sullivan
Keyword(s):  

2018 ◽  
Vol 181 (4) ◽  
pp. 303-309 ◽  
Author(s):  
C Yamauchi-Kawaura ◽  
S Yamamoto ◽  
K Fujii ◽  
M Komori ◽  
M Yamauchi ◽  
...  

Author(s):  
Laure Vieillevigne ◽  
Dimitri Lefkopoulos ◽  
Pascal Grandjean ◽  
Catherine Dejean ◽  
Frédéric Julia

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