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https://www.readbyqxmd.com/read/28048910/su-g-jep2-10-on-the-need-for-a-dynamic-model-for-patient-specific-distortion-corrections-for-mr-only-pelvis-treatment-planning
#1
C Glide-Hurst, W Zheng, C Stehning, S Weiss, S Renisch
PURPOSE: Patient-specific distortions, particularly near tissue/air interfaces, require assessment and possible corrections for MRI-only radiation treatment planning (RTP). However, patients are dynamic due to changes in physiological status and motion during imaging sessions. This work investigated the need for dynamic patient-specific distortion corrections to support pelvis MR-only RTP. METHODS: The pelvises of healthy volunteers were imaged at 1.0T, 1.5T, and 3...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047989/tu-ab-bra-03-atlas-based-algorithms-with-local-registration-goodness-weighting-for-mri-driven-electron-density-mapping
#2
R Farjam, N Tyagi, H Veeraraghavan, A Apte, K Zakian, M Hunt, J Deasy
PURPOSE: To develop image-analysis algorithms to synthesize CT with accurate electron densities for MR-only radiotherapy of head & neck (H&N) and pelvis anatomies. METHODS: CT and 3T-MRI (Philips, mDixon sequence) scans were randomly selected from a pool of H&N (n=11) and pelvis (n=12) anatomies to form an atlas. All MRIs were pre-processed to eliminate scanner and patient-induced intensity inhomogeneities and standardize their intensity histograms. CT and MRI for each patient were then co-registered to construct CT-MRI atlases...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047295/tu-h-206-04-an-effective-homomorphic-unsharp-mask-filtering-method-to-correct-intensity-inhomogeneity-in-daily-treatment-mr-images
#3
D Yang, H Gach, H Li, S Mutic
PURPOSE: The daily treatment MRIs acquired on MR-IGRT systems, like diagnostic MRIs, suffer from intensity inhomogeneity issue, associated with B1 and B0 inhomogeneities. An improved homomorphic unsharp mask (HUM) filtering method, automatic and robust body segmentation, and imaging field-of-view (FOV) detection methods were developed to compute the multiplicative slow-varying correction field and correct the intensity inhomogeneity. The goal is to improve and normalize the voxel intensity so that the images could be processed more accurately by quantitative methods (e...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047055/su-g-jep2-06-dosimetric-and-workflow-evaluation-of-first-commercial-synthetic-ct-software-for-clinical-use-in-pelvis
#4
N Tyagi, J Zhang, L Happersett, M Kadbi, J Mechalakos, J Deasy, M Hunt
PURPOSE: evaluate a commercial synthetic CT (syn-CT) software for use in prostate radiotherapy METHODS: Twenty prostate patients underwent CT and MR simulation scans in treatment position on a 3T Philips scanner. The MR protocol consisted of a T2w turbo spin-echo for soft tissue contrast, a 2D balanced-fast field echo (b-FFE) for fiducial identification, a dual-echo 3D FFE B0 map for distortion analysis and a 3D mDIXON FFE sequence to generate syn-CT. Two echoes are acquired during mDIXON scan, allowing water, fat, and in-phase images to be derived using the frequency shift of the fat and water protons...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047002/su-f-r-25-automatic-identification-of-suspicious-recurrent-residual-disease-regions-after-prostatectomy
#5
N A Parra, M Abramowitz, A Pollack, R Stoyanova
PURPOSE: To automatically identify and outline suspicious regions of recurrent or residual disease in the prostate bed using Dynamic Contrast Enhanced-MRI (DCE-MRI) in patients after prostatectomy. METHODS: Twenty-two patients presenting for salvage radiotherapy and with identified Gross Tumor Volume (GTV) in the prostate bed were retrospectively analyzed. The MRI data consisted of Axial T2weighted-MRI (T2w) of the pelvis: resolution 1.25×1.25×2.5 mm; Field of View (FOV): 320×320 mm; slice thickness=2...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046967/su-g-iep1-09-mri-evaluation-of-a-direction-modulated-brachytherapy-dmbt-tandem-applicator-for-cervical-cancer-on-3t
#6
A Soliman, D Han, A Elzibak, H Safigholi, S Mashouf, A Owrangi, A Ravi, W Song
PURPOSE: To assess image quality and artifact extent of a novel direction modulated brachytherapy (DMBT) tandem applicator on a 3T MRI using various clinical imaging sequences. METHODS: The tandem applicator is composed of a tungsten alloy with 6 peripheral grooves covered with a PEEK tip. An MR-compatible phantom with similar dimensions to the female pelvis was manufactured. To visually assess the spatial shift of the applicator's tip, a mountable radial-fiducial with 4 plastic rods, each of 3mm diameter, was designed to tightly fit on the applicator...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28042048/gross-hematuria-in-infancy-a-case-of-renal-hemangioma-managed-endoscopically
#7
Bruce J Schlomer
A case of renal hemangioma in a male infant managed endoscopically is reported. The patient initially presented at 6 months of age to a nephrology clinic with gross hematuria and was found to have what was thought to be a renal cyst. He was referred to urology clinic at 18 months after having continued gross hematuria and negative nephrology evaluation. A magnetic resonance imaging suggested an enhancing mass in the renal pelvis and hydronephrotic upper pole cyst that was mistaken as cyst on ultrasound. A 1...
December 29, 2016: Urology
https://www.readbyqxmd.com/read/28031042/transitional-cell-carcinoma-with-extension-of-the-renal-vein-and-ivc-tumor-thrombus-report-of-three-cases-and-literature-review
#8
Mingyang Li, An Shi, Wen Kong, Jin Zhang, Yonghui Chen, Jiwei Huang, Yiran Huang
BACKGROUND: Transitional cell carcinoma (TCC) originating from the renal pelvis with a venous tumor thrombus is a rare entity. However, clinicians should be aware of it because of its high malignancy and poor prognosis. CASE PRESENTATION: Here, we report three cases of pathologically confirmed TCC originating from the renal pelvis with extension into the renal vein or inferior vena cava (IVC). Of these patients, two are males and one is female (58~73 years old)...
December 28, 2016: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28011890/idiopathic-myelofibrosis-with-disseminated-hepatosplenic-mesenteric-renal-and-pulmonary-extramedullary-haematopoeisis-portal-hypertension-and-tuberculosis-initial-presentation-and-2%C3%A2-years-follow-up
#9
Ananya Panda, Sheragaru Hanumanthappa Chandrashekhara, Aruna Nambirajan, Pravas Mishra
A 35-year-old man with a 12-year history of idiopathic myelofibrosis (IMF) presented in 2014 with fatigue and abdominal distension. CT scan revealed massive hepatosplenomegaly with focal splenic lesions, soft tissue around renal pelvis, mesenteric masses compressing bowel loops and perilymphatic nodules in lungs. There was portal hypertension, ascites, pleural effusion, bilateral psoas abscesses and necrotic retroperitoneal lymphadenopathy. MRI additionally revealed hypointense periportal infiltrative lesions in liver, not seen on CT scan...
December 23, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/28011045/diffusion-weighted-magnetic-resonance-imaging-as-a-predictor-of-outcome-in-cervical-cancer-after-chemoradiation
#10
Jennifer C Ho, Pamela K Allen, Priya R Bhosale, Gaiane M Rauch, Clifton D Fuller, Abdallah S R Mohamed, Michael Frumovitz, Anuja Jhingran, Ann H Klopp
PURPOSE: To determine whether apparent diffusion coefficient (ADC) value is predictive of survival after definitive chemoradiation for cervical cancer independent of established imaging and clinical prognostic factors. METHODS AND MATERIALS: Between 2011 and 2013, the pretreatment MRI scans for 69 patients treated with definitive chemoradiation for newly diagnosed cervical cancer were retrieved. Scans were acquired with a 1.5-T magnetic resonance scanner, including diffusion-weighted imaging sequences...
November 17, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28009753/efficacy-and-safety-of-selective-arterial-embolization-in-the-treatment-of-aneurysmal-bone-cyst-of-the-mobile-spine-a-retrospective-observational-study
#11
Silvia Terzi, Alessandro Gasbarrini, Mario Fuiano, Giovanni Barbanti Brodano, Riccardo Ghermandi, Stefano Bandiera, Stefano Boriani
STUDY DESIGN: Retrospective observational study. OBJECTIVE: Our aim is to define the efficacy and safety of serial selective arterial embolization (SAE) in the treatment of aneurysmal bone cysts, to explore potential treatment alternatives and to define a therapeutic algorithm. SUMMARY OF BACKGROUND DATA: Aneurysmal bone cyst (ABC) is a benign lesion with unpredictable behavior. Its treatment is challenging especially in poorly accessible surgical areas, such as spine and pelvis...
December 22, 2016: Spine
https://www.readbyqxmd.com/read/28003610/the-impact-of-gadolinium-based-contrast-agent-for-carbon-ion-radiotherapy
#12
Nao Mogi, Makoto Sakai, Ryosuke Okada, Yusuke Itabashi, Yasuhiro Fukushima, Yoshiki Kubota, Takayuki Sutou, Takashi Nakano, Tatsuya Ohno
PURPOSE: The contrast agent used in the diagnostic department has high atomic numbers and might influence dose deposition in the particle therapy. In particular, the influence of gadolinium-based (Gd) contrast agent on range in carbon ion radiotherapy has not yet been evaluated. For this reason, we avoid carbon treatment and planning computed tomography (CT) acquisition on days when the contrast-enhanced magnetic resonance image (MRI) is performed. In this study, we evaluated the time required for this beam range effect to vanish by evaluating the temporal changes in the CT values after an enhanced MRI as well as the stopping power of Gd solution...
2016: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/27983520/dosimetric-and-workflow-evaluation-of-first-commercial-synthetic-ct-software-for-clinical-use-in-pelvis
#13
Neelam Tyagi, Sandra Fontenla, Jing Zhang, Michelle Cloutier, Mo Kadbi, James Mechalakos, Michael Zelefsky, Joseph Deasy, Margie Hunt
PURPOSE: To evaluate a commercial synthetic CT (syn-CT) software for use in prostate radiotherapy Methods: Twenty-five prostate patients underwent CT and MR simulation scans in treatment position on a 3T MR scanner. A commercially available MR protocol was used that included a T2w turbo spin-echo sequence for soft-tissue contrast and a dual echo 3-D mDIXON fast field echo (FFE) sequence for generating syn-CT. A dual-echo 3-D FFE B0 map was used for patient-induced susceptibility distortion analysis and a new 3-D balanced-FFE sequence was evaluated for identification of implanted gold fiducial markers and subsequent image-guidance during radiotherapy delivery...
December 16, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27974964/aggressive-angiomyxoma-of-the-pelvis-and-perineum-a-case-report-and-literature-review
#14
Rashid Saif Al-Umairi, Atheel Kamona, Fadhila Mohammed Al-Busaidi
Aggressive angiomyxoma (AA) is a rare mesenchymal tumor that usually occurs in the pelvis and perineum of young females. AA can simulate Bartholin's gland cyst, abscess, lipoma, simple labial cyst, or other pelvic soft tissue tumors. Cross-sectional imaging, particularly magnetic resonance imaging (MRI), plays an essential role in the diagnosis and management of AA. We report a case of AA in a 38-year-old woman with typical MRI features. We also present the findings of a literature review on the radiological features of this disease...
November 2016: Oman Medical Journal
https://www.readbyqxmd.com/read/27933409/imaging-trends-in-suspected-appendicitis-a-canadian-perspective
#15
Victoria F Tan, Michael N Patlas, Douglas S Katz
PURPOSE: The purpose of our study was to assess trends in the imaging of suspected appendicitis in adult patients in emergency departments of academic centers in Canada. METHODS: A questionnaire was sent to all 17 academic centers in Canada to be completed by a radiologist who works in emergency radiology. The questionnaires were sent and collected over a period of 4 months from October 2015 to February 2016. RESULTS: Sixteen centers (94%) responded to the questionnaire...
December 8, 2016: Emergency Radiology
https://www.readbyqxmd.com/read/27909773/magnetic-resonance-imaging-of-fetal-pelvic-cysts
#16
REVIEW
Styliani Archontaki, Yvan Vial, Sylviane Hanquinet, Reto Meuli, Leonor Alamo
The detection of fetal anomalies has improved in the last years as a result of the generalization of ultrasound pregnancy screening exams. The presence of a cystic imaging in the fetal pelvis is a relatively common finding, which can correspond to a real congenital cystic lesion or result from the anomalous liquid accumulation in a whole pelvic organ, mainly the urinary bladder, the uterus, or the vagina. In selected cases with poor prognosis and/or inconclusive echographic findings, magnetic resonance may bring additional information in terms of the characterization, anatomical location, and real extension of the pathology...
December 2016: Abdominal Radiology
https://www.readbyqxmd.com/read/27907939/intraoperative-intermittent-blocking-of-the-common-iliac-arteries-in-cases-of-placenta-percreta-without-the-use-of-fluoroscopy
#17
S Heinze, B Filsinger, G Kastenholz, R J Schröder
Background: The number of patients with placenta accreta, percreta and increta is increasing. The morbidity and mortality are higher mostly due to hemorrhage. Therefore, new methods to reduce the risk of severe bleeding are necessary. Methods: Three patients were treated in collaboration by obstetricians, urologists, anesthesiologists, and radiologists. An MRI of the pelvis was performed and the diameters and lengths of the iliac arteries were measured to avoid fluoroscopy during the preoperative placement of catheter balloons into the iliac arteries...
December 2016: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/27895684/investigation-of-the-gold-nanoparticles-effects-on-the-prostate-dose-distribution-in-brachytherapy-gel-dosimetry-and-monte-carlo-method
#18
Hossein Khosravi, Bijan Hashemi, Faezeh Rahmani, Ahmad Ebadi
PURPOSE: In this work, gold nanoparticles (GNPs) were embedded in the MAGIC-f polymer gel irradiated with the (192)Ir brachytherapy sources. MATERIAL AND METHODS: At the first plexiglas phantom was made as the human pelvis. The GNPs were synthesized with 15 nm in diameter and 0.1 mM (0.0197 mg/ml) in concentration by using a chemical reduction method. Then, the MAGIC-f gel was synthesized. The fabricated gel was poured into the tubes located at the prostate (with and without the GNPs) locations of the phantom...
October 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27891410/subperiosteal-schwannoma-of-pelvis-a-rare-case-and-review-of-literature
#19
Devendra Lakhotia, Sunil Jeph, Swati Sharma
Schwannoma are benign tumours of the nerve sheath. They are commonly found in the soft tissue, but its presence in the bone is extremely rare. We herein present a case of 34-year-old man with two adjacent pelvic subperiosteal schwannomas. Computed Tomography (CT) scan showed osseous pressure erosion and Magnetic Resonance Imaging (MRI) showed two cystic signal intensity lesions, one near superior aspect of right posterior iliac wing and another inferior to it with adjacent cortical pressure erosion. The tumour was excised en bloc and on histopathological examination, the diagnosis was confirmed as subperiosteal schwannoma...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27875188/pelvis-atlas-based-surgical-planning-for-oncological-pelvic-surgery
#20
Noeska Smit, Kai Lawonn, Annelot Kraima, Marco DeRuiter, Hessam Sokooti, Stefan Bruckner, Elmar Eisemann, Anna Vilanova
Due to the intricate relationship between the pelvic organs and vital structures, such as vessels and nerves, pelvic anatomy is often considered to be complex to comprehend. In oncological pelvic surgery, a trade-off has to be made between complete tumor resection and preserving function by preventing damage to the nerves. Damage to the autonomic nerves causes undesirable post-operative side-effects such as fecal and urinal incontinence, as well as sexual dysfunction in up to 80 percent of the cases. Since these autonomic nerves are not visible in pre-operative MRI scans or during surgery, avoiding nerve damage during such a surgical procedure becomes challenging...
January 2017: IEEE Transactions on Visualization and Computer Graphics
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