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Anatomy of the prostate

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https://www.readbyqxmd.com/read/29334027/patient-specific-quality-assurance-using-monte-carlo-dose-calculation-and-elekta-log-files-for-prostate-volumetric-modulated-arc-therapy
#1
Yoshiyuki Katsuta, Noriyuki Kadoya, Yukio Fujita, Eiji Shimizu, Kenichi Matsunaga, Kinya Sawada, Haruo Matsushita, Kazuhiro Majima, Keiichi Jingu
Log file-based methods are attracting increasing interest owing to their ability to validate volumetric-modulated arc therapy outputs with high resolution in the leaf and gantry positions and in delivered dose. Cross-validation of these methods for comparison with measurement-based methods using the ionization chamber/ArcCHECK-3DVH software (version 3.2.0) under the same conditions of treatment anatomy and plan enables an efficient evaluation of this method. In this study, with the purpose of cross-validation, we evaluate the accuracy of a log file-based method using Elekta log files and an X-ray voxel Monte Carlo dose calculation technique in the case of leaf misalignment during prostate volumetric-modulated arc therapy...
December 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/29277793/retzius-sparing-robotic-assisted-radical-prostatectomy-associated-with-less-bladder-neck-descent-and-better-early-continence-outcome
#2
Li-Wen Chang, Sheng-Chun Hung, Ju-Chuan Hu, Kun-Yuan Chiu
BACKGROUND/AIM: We attempted to evaluate the association of early continence outcome of Retzius-sparing robotic assisted radical prostatectomy (RARP) and bladder neck descent with postoperative cystography. PATIENTS AND METHODS: From November 2014 to December 2015, 30 patients with prostate cancer who received Retzius-sparing LRP/ RARP were compared to 30 patients that received retropubic approach RARP with propensity score matching analysis. Cystogram was used to evaluate the bladder neck descent using the bladder neck to pubic symphysis (BNPS) ratio and the continence state was evaluated...
January 2018: Anticancer Research
https://www.readbyqxmd.com/read/29245445/increasing-diversity-of-land-planarians-platyhelminthes-geoplanidae-in-the-interior-atlantic-forest-with-the-description-of-two-new-species-and-new-records-from-argentina
#3
Lisandro Negrete, Francisco Brusa
Here, we describe two new species of land planarians of the genera Pasipha and Imbira from the Atlantic Forest of Argentina: Pasipha quirogai sp. nov. and Imbira negrita sp. nov. Their external features and internal anatomy distinguish them from their congeners. Pasipha quirogai sp. nov. is about 40mm long, characterized by brown beige dorsal pigmentation with a golden yellow median band and thin graphite black para-median stripes, cylindrical pharynx, extrabulbar prostatic vesicle with paired proximal portion, male atrium with small folds in its proximal part, and female canal opening into the dorso-caudal wall of the female atrium...
December 4, 2017: Zootaxa
https://www.readbyqxmd.com/read/29245259/efficacy-of-pudendal-nerve-block-for-alleviation-of-catheter-related-bladder-discomfort-in-male-patients-undergoing-lower-urinary-tract-surgeries-a-randomized-controlled-double-blind-trial
#4
Li Xiaoqiang, Zhang Xuerong, Liu Juan, Bechu Shelley Mathew, Yin Xiaorong, Wan Qin, Luo Lili, Zhu Yingying, Luo Jun
BACKGROUND: Catheter-related bladder discomfort (CRBD) to an indwelling urinary catheter is defined as a painful urethral discomfort, resistant to conventional opioid therapy, decreasing the quality of postoperative recovery. According to anatomy, the branches of sacral somatic nerves form the afferent nerves of the urethra and bladder triangle, which deriving from the ventral rami of the second to fourth sacral spinal nerves, innervating the urethral muscles and sphincter of the perineum and pelvic floor; as well as providing sensation to the penis and clitoris in males and females, which including the urethra and bladder triangle...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29241947/effects-of-sublingual-glyceryl-trinitrate-administration-on-the-quality-of-preprocedure-ct-angiography-performed-to-plan-prostate-artery-embolization
#5
Mark W Little, Andrew C Macdonald, Phil Boardman, Mark J Bratby, Suzie Anthony, Mohammed Hadi, Charles R Tapping
PURPOSE: To determine the effects of sublingual glyceryl trinitrate (GTN) on the quality of planning computed tomography (CT) angiography performed prior to prostate artery embolization (PAE). MATERIALS AND METHODS: A retrospective cohort study was performed on patients who had previously undergone CT angiography before a procedure for PAE at our institution. Early CT angiography studies for PAE at our single center had initially been performed without GTN. These were compared to subsequent CT angiography studies that had been performed with GTN, after a previously implemented change in practice...
December 11, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/29238628/intraprostatic-fiducials-compared-with-bony-anatomy-and-skin-marks-for-image-guided-radiation-therapy-of-prostate-cancer
#6
Juliette Moreau, Julian Biau, Jean-Louis Achard, Ivan Toledano, Charles Benhaim, Fabrice Kwiatkowski, Geneviève Loos, Michel Lapeyre
Purpose Prostate motion occurs during radiotherapy for localized prostate cancer. We evaluated the input of intraprostatic fiducials for image-guided radiation therapy and compared it with bony anatomy and skin marks. Methods Eleven patients were implanted with three fiducial markers in the prostate. Daily sets of orthogonal kV-kV images were compared with digitally reconstructed radiography. Data were recorded for skin marks, bony anatomy, and fiducial markers. The variations were analyzed along three principal axes (left-right: LR, superoinferior: SI, and anteroposterior: AP)...
October 12, 2017: Curēus
https://www.readbyqxmd.com/read/29226429/morphological-variations-of-the-human-ejaculatory-ducts-in-relation-to-the-prostatic-urethra
#7
A P Malalasekera, K Sivasuganthan, S Sarangan, K Thaneshan, D N Weerakoon, Y Mathangasinghe, C L Gunasekera, S Mallawaarachchi, N D Nanayakkara, D J Anthony, D Ediriweera
PURPOSE: Loss of ejaculation can follow transurethral resection of the prostate (TURP). Periverumontanal prostate tissue is preserved in ejaculation-preserving TURP (ep-TURP). Knowledge of ejaculatory duct anatomy in relation to the prostatic urethra can help in ep-TURP. This was evaluated in cross-sections of the prostate using a 3D model to determine a safe zone for resecting the prostate in ep-TURP. MATERIALS AND METHODS: A 3D reconstruction of the ejaculatory ducts was developed on the basis of six prostate gland cross-sections...
December 11, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/29173901/clinical-impact-of-dosimetric-changes-for-volumetric-modulated-arc-therapy-in-log-file-based-patient-dose-calculations
#8
Yoshiyuki Katsuta, Noriyuki Kadoya, Yukio Fujita, Eiji Shimizu, Kenichi Matsunaga, Haruo Matsushita, Kazuhiro Majima, Keiichi Jingu
PURPOSE: A log file-based method cannot detect dosimetric changes due to linac component miscalibration because log files are insensitive to miscalibration. Herein, clinical impacts of dosimetric changes on a log file-based method were determined. METHODS AND MATERIALS: Five head-and-neck and five prostate plans were applied. Miscalibration-simulated log files were generated by inducing a linac component miscalibration into the log file. Miscalibration magnitudes for leaf, gantry, and collimator at the general tolerance level were ±0...
October 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/29167966/planning-prostate-artery-embolisation-is-it-essential-to-perform-a-pre-procedural-cta
#9
Drew Maclean, Ben Maher, Mark Harris, Jonathan Dyer, Sachin Modi, Nigel Hacking, Timothy Bryant
PURPOSE: A highly variable prostatic artery origin coupled with frequent anastomoses to adjacent organs makes prostate artery embolisation a challenging procedure. Despite CT angiography facilitating procedural planning, it is not performed in all centres. Therefore, we explored the utility of prostatic CT angiography by assessing its capacity to identify the prostatic arteries and highlight troublesome anastomoses. MATERIALS AND METHODS: A retrospective review of patients undergoing prostate artery embolisation for symptoms of benign prostatic obstruction between June 2012 and October 2016 was conducted, with analysis of the pre-procedural CT angiography...
November 22, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/29159885/two-stage-ionoacoustic-range-verification-leveraging-monte-carlo-and-acoustic-simulations-to-stably-account-for-tissue-inhomogeneity-and-accelerator-specific-time-structure-a-simulation-study
#10
Sarah K Patch, Daniel E M Hoff, Tyler B Webb, Lee G Sobotka, Tianyu Zhao
PURPOSE: Range errors constrain treatment planning by limiting choice of ion beam angles and requiring large margins. Ionoacoustic range verification requires recovering the location of an acoustic source from low frequency signals. A priori information is applied to stably overcome resolution limits of inverse acoustic source imaging in this simulation study. In particular, the accuracy and robustness of ionoacoustic range verification for lateral and oblique delivery of high-energy protons to the prostate is examined...
November 20, 2017: Medical Physics
https://www.readbyqxmd.com/read/29129577/pelvic-bone-anatomy-vs-implanted-gold-seed-marker-registration-for-image-guided-intensity-modulated-radiotherapy-for-prostate-carcinoma-comparative-analysis-of-inter-fraction-motion-and-toxicities
#11
Madhup Rastogi, Sambit Swarup Nanda, Ajeet Kumar Gandhi, Divakar Dalela, Rohini Khurana, Surendra Prasad Mishra, Anoop Srivastava, S Farzana, Madan Lal Brahma Bhatt, Nuzhat Husain
OBJECTIVES: We compared the prostate motion variability and toxicities between patients treated with gold marker registration based IG-IMRT (IG-IMRT-M) and bony landmark registration based IG-IMRT (IG-IMRT-B). METHODS: T1c-T3b (node negative), intermediate and high risk (non-metastatic) adenocarcinoma of prostate, age ≥18years, Karnofsky Performance Status of ≥70 were included in this retrospective study. The prostate motion variability, acute and late radiation toxicities between the two treatment arms (IG-IMRT-M versus IG-IMRT-B) were compared...
November 9, 2017: Journal of the Egyptian National Cancer Institute
https://www.readbyqxmd.com/read/29119604/anatomy-and-histology-of-the-prostate-and-glands-of-cowper-in-three-species-of-neotropical-bats
#12
María Daniela Miotti, Marcos I Mollerach, Ruben M Barquez
The reproductive accessory glands (RAG) are essential components in reproduction because their secretion products ensure survival, viability, and sperm motility. The objective of this study was to characterize and compare the morphological and histological structure of the RAG in three species of bats of the genus Sturnira (S. erythromos, S. lilium, and S. oporaphilum). The RAG complex comprise a compact gland (prostate), which surrounds the urethra, and a pair of Glands of Cowper at the base of penis. Anatomical and histologically, the prostate are differentiated in two regions, ventral and dorsal...
November 9, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/29116960/image-quality-and-geometric-distortion-of-modern-diffusion-weighted-imaging-sequences-in-magnetic-resonance-imaging-of-the-prostate
#13
Daniel Stocker, Andrei Manoliu, Anton S Becker, Borna K Barth, Daniel Nanz, Markus Klarhöfer, Olivio F Donati
PURPOSE: The aim of this study was to compare qualitative and quantitative image quality and geometric distortion of 4 magnetic resonance diffusion-weighted imaging (DWI) sequences of the prostate using comparable imaging parameters and similar acquisition times. METHODS AND MATERIALS: Axial T2-weighted turbo spin echo images and axial DWI echo-planar imaging (EPI) sequences, including single-shot spin-echo (ss-EPI), readout-segmented multishot (rs-EPI), selective excitation-reduced field of view (sTX-EPI), and prototype single-shot technique applying slice-specific shimming (iShim-EPI) sequences, were acquired at 3 T in 10 healthy volunteers (mean age, 26...
November 8, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/29099727/supplemental-computational-phantoms-to-estimate-out-of-field-absorbed-dose-in-photon-radiotherapy
#14
Kyle Joseph Gallagher, Jaad Tannous, Racile Nabha, Joelle Ann Feghali, Zeina Ayoub, Wassim T Jalbout, Bassem Youssef, Phillip J Taddei
The purpose of this study was to develop a straightforward method of supplementing patient anatomy and estimating out-of-field absorbed dose for a cohort of pediatric radiotherapy patients with limited recorded anatomy. A cohort of nine children, aged 2 to 14 years, who received three-dimensional conformal radiotherapy for low grade localized brain tumors (LBTs), were randomly selected for this study. The extents of these patients' computed tomography simulation image sets were cranial only. To approximate their missing anatomy, we supplemented the LBT patients' image sets with computed tomography images of patients in a previous study with larger extents of matched sex, height, and mass and for whom contours of organs at risk for radiogenic cancer had already been delineated...
November 3, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29051038/image-guided-radiation-therapy-strategies-for-pelvic-lymph-node-irradiation-in-high-risk-prostate-cancer-motion-and-margins
#15
Lucy Kershaw, Laila van Zadelhoff, Wilma Heemsbergen, Floris Pos, Marcel van Herk
PURPOSE: To quantify the relative motion of the pelvic lymph nodes (LNs), seminal vesicles (SV) and prostate and define indicative margins for image-guided radiotherapy based on bony anatomy or prostate correction strategies for a 3 or 6 degrees-of-freedom couch. METHODS AND MATERIALS: Nineteen patients had a planning computed tomography (CT) scan followed by a mean of 11 repeated CT scans during radiation therapy. The prostate, SV, and external and internal iliac LN regions on the left and right were outlined on each CT scan...
September 8, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29038334/anatomy-and-histology-of-the-human-and-murine-prostate
#16
Michael Ittmann
The human and murine prostate glands have similar functional roles in the generation of seminal fluid to assist in reproduction. There are significant differences in the anatomy and histology of murine and human prostate and knowledge of the normal anatomy and histology of the murine prostate is essential to interpreting changes in genetically engineered mouse models. In this review, the normal anatomy and histology of both human and mouse prostate will be described.
October 16, 2017: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/28965315/surgical-techniques-for-managing-post-prostatectomy-erectile-dysfunction
#17
REVIEW
Fabio Castiglione, David J Ralph, Asif Muneer
PURPOSE OF REVIEW: Due to the increasing numbers of radical prostatectomies (RP) performed for prostate cancer, a substantial number of patients are now suffering from post-operative erectile dysfunction (ED). The aim of this study is to summarize the current literature on surgical techniques for managing post-prostatectomy erectile dysfunction. RECENT FINDINGS: The PubMed database was searched for English-language articles published up to Jan 2017 using the following search terms: "prostatectomy AND erectile dysfunction", "prostatectomy AND penile prostheses", and "prostatectomy AND penile implants"...
September 30, 2017: Current Urology Reports
https://www.readbyqxmd.com/read/28963047/first-case-of-2-synchronous-gluteal-arteries-aneurysms-treated-by-endovascular-plug-embolization-case-report-and-literature-review
#18
Andrea Esposito, Danilo Menna, Matteo Salcuni, Ferdinando Di Leo, Pietro Benedetto, Antonio Trani, Antonino Pierluigi Cappiello
INTRODUCTION: Gluteal artery aneurysms (GAAs) are rare, accounting for less than 1% of all arterial aneurysms. Most of them are post-traumatic in nature and involve the superior gluteal artery (SGA), while injuries of the inferior gluteal artery (IGA) have been reported less frequently. We report an unusual case of a patient with double saccular GAA of unknown etiology, involving both the SGA and IGA, successfully treated by endovascular embolization. CASE REPORT: A 80-year-old man referred to our hospital complaining of the progressive onset of left buttock pain and swelling exacerbated by sitting position in the last 4 months...
September 28, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28951749/evaluation-of-intraoperative-magnetic-resonance-imaging-ultrasound-fusion-optimization-for-low-dose-rate-prostate-brachytherapy
#19
Stephen Abel, Paul Renz, Olivier Gayou, Jie Tang, E Day Werts, Mark Trombetta
PURPOSE: Intraoperative planning with transrectal ultrasound (US) is used for accurate seed placement and optimal dosimetry in prostate brachytherapy. However, prostate magnetic resonance imaging (MRI) has shown superiority in delineation of prostate anatomy. Accordingly, MRI/US fusion may be useful for accurate intraoperative planning. We analyzed planning with MRI/US fusion to compare differences in dosimetry and volume to that derived from the postoperative computed tomography (CT)...
August 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28941739/the-influence-of-inter-fractional-anatomy-variation-on-secondary-cancer-risk-estimates-following-radiotherapy
#20
Camilla Hanquist Stokkevåg, Grete May Engeseth, Liv Bolstad Hysing, Kristian Smeland Ytre-Hauge, Ludvig Paul Muren
PURPOSE: In silico studies comparing estimated risks of radiation-induced secondary cancer (SC) are frequently performed in assessment of radiotherapy techniques. Since inter-patient anatomy variations can result in considerable differences in estimated risk we aimed to explore the influence of inter-fractional organ motion patterns on SC risk. METHODS: Volumetric modulated arc therapy (VMAT) and intensity-modulated proton therapy (IMPT) plans were generated on the planning CT (pCT) scans of eight prostate cancer patients...
September 20, 2017: Physica Medica: PM
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