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https://www.readbyqxmd.com/read/28306550/female-pelvic-synthetic-ct-generation-based-on-joint-intensity-and-shape-analysis
#1
Lianli Liu, Shruti Jolly, Yue Cao, Karen Vineberg, Jeffrey A Fessler, James M Balter
Using MRI for radiotherapy treatment planning and image guidance is appealing as it provides superior soft tissue information over CT scans and avoids possible systematic errors introduced by aligning MR to CT images. This study presents a method that generates Synthetic CT (MRCT) volumes by performing probabilistic tissue classification of voxels from MRI data using a single imaging sequence (T1 Dixon). The intensity overlap between different tissues on MR images, a major challenge for voxel-based MRCT generation methods, is addressed by adding bone shape information to an intensity-based classification scheme...
April 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28302242/vanishing-white-matter-vwm-disease-presenting-as-neuro-ovarian-failure
#2
Abidullah Khan, Mohammad Humayun, Maimoona Ayub, Iqbal Haider, Fahad Ajmal, Syed Saad Shah
A 19-year girl was admitted with a one-month history of worsening spastic paraparesis, cerbellar ataxia, visual decline and worsening headaches on a background of walking difficulty, progressive quadriparesis and migraine since the age of 10 years. She had no sensory loss, and cranial nerves examination was notable for optic atrophy with crescent formation only. She had primary amenorrhea and underdeveloped secondary sexual characteristics. Ultrasonograhic studies of the pelvis confirmed small ovaries, and uterus...
March 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28301537/dedifferentiated-chondrosarcoma-radiological-features-prognostic-factors-and-survival-statistics-in-23-patients
#3
Chenglei Liu, Yan Xi, Mei Li, Qiong Jiao, Huizhen Zhang, Qingcheng Yang, Weiwu Yao
BACKGROUND: Dedifferentiated chondrosarcoma is a rare, highly malignant tumor with a poor survival. There are many confusing issues concerning the imaging feature that can facilitate early diagnosis and the factors that might be related to outcomes. METHODS: Twenty-three patients with dedifferentiated chondrosarcoma confirmed by pathology were retrospectively reviewed from 2008 to 2015. The patients' clinical information, images from radiographs (n = 17), CT (n = 19), and MRI (n = 17), histological features, treatment and prognosis were analyzed...
2017: PloS One
https://www.readbyqxmd.com/read/28290736/accuracy-and-reliability-of-marker-based-approaches-to-scale-the-pelvis-thigh-and-shank-segments-in-musculoskeletal-models
#4
Hans Kainz, Hoa Hoang, Chris Stockton, Roslyn R Boyd, David G Lloyd, Christopher P Carty
Gait analysis together with musculoskeletal modelling is widely used for research. In the absence of medical images, surface marker locations are used to scale a generic model to the individual's anthropometry. Studies evaluating the accuracy and reliability of different scaling approaches in a paediatric and/or clinical population have not yet been conducted and, therefore, formed the aim of this study. Magnetic resonance images (MRI) and motion capture data were collected from twelve participants with cerebral palsy and six typically developed participants...
March 14, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28274482/clinical-characteristics-of-patients-with-bone-sarcoidosis
#5
Ying Zhou, Elyse E Lower, Huiping Li, Yolanda Farhey, Robert P Baughman
OBJECTIVE: To assess the clinical features, diagnosis, and treatment of bone sarcoidosis in the United States. METHODS: Patients with bone sarcoidosis were identified and matched to sarcoidosis patients based on race, gender, and age. Detailed characteristics were obtained by medical record review. RESULTS: A total of 64 patients with bone sarcoidosis were enrolled in this study. The female:male ratio was 1.46:1 and the white:black ratio was 3:1...
February 10, 2017: Seminars in Arthritis and Rheumatism
https://www.readbyqxmd.com/read/28263827/a-fast-method-for-the-quantification-of-fat-fraction-and-relaxation-times-comparison-of-five-sites-of-bone-marrow
#6
Caroline Le Ster, Jérémy Lasbleiz, Stephan Kannengiesser, Raphaël Guillin, Giulio Gambarota, Hervé Saint-Jalmes
PURPOSE: Bone marrow is found either as red bone marrow, which mainly contains haematopoietic cells, or yellow bone marrow, which mainly contains adipocytes. In adults, red bone marrow is principally located in the axial skeleton. A recent study has introduced a method to simultaneously estimate the fat fraction (FF), the T1 and T2* relaxation times of water (T1w, T2*w) and fat (T1f and T2*f) in the vertebral bone marrow. The aim of the current study was to measure FF, T1w, T1f, T2*w and T2*f in five sites of bone marrow, and to assess the presence of regional variations...
March 2, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28258300/pelvic-and-lower-extremity-physiological-cross-sectional-areas-an-mri-study-of-the-living-young-and-comparison-to-published-research-literature
#7
Juliane Lube, Natasha A M S Flack, Sebastian Cotofana, Orkun Özkurtul, Stephanie J Woodley, Stefan Zachow, Niels Hammer
PURPOSE: Morphological data pertaining to the pelvis and lower extremity muscles are increasingly being used in biomechanical modeling to compare healthy and pathological conditions. Very few data sets exist that encompass all of the muscles of the lower limb, allowing for comparisons between regions. The aims of this study were to (a) provide physiological cross-sectional area (PCSA) data for the pelvic, thigh, and leg muscles in young, healthy participants, using magnetic resonance imaging (MRI), and (b) to compare these data with summarized PCSAs obtained from the literature...
March 3, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28249339/dual-energy-ct-a-novel-technique-for-diagnostic-testing-of-fragility-fractures-of-the-pelvis
#8
Carsten Hackenbroch, Hans-Joachim Riesner, Patricia Lang, Fabian Stuby, Burkhardt Danz, Benedikt Friemert, Hans-Georg Palm
Background The incidence of fragility fractures of the pelvis is increasing. Established methods to diagnose this condition include X-rays, computed tomography (CT) and magnetic resonance imaging (MRI). Dual energy CT (DECT) is a modern technology for the imaging of bone oedema/bruises and has been used in injuries of the extremities and spine. It is unclear whether this technique can also be used in fragility fractures of the pelvis. The aim of this study was to perform a literature research and survey of the "AG Becken III" members of the German Society of Trauma Surgery (DGU) on the usefulness of DECT in fractures of the pelvis...
February 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28237184/soft-tissue-displacement-over-pelvic-anatomical-landmarks-during-3-d-hip-movements
#9
V Camomilla, T Bonci, A Cappozzo
The position, in a pelvis-embedded anatomical coordinate system, of skin points located over the following anatomical landmarks (AL) was determined while the hip assumed different spatial postures: right and left anterior superior and posterior superior iliac spines, and the sacrum. Postures were selected as occurring during walking and during a flexion-extension and circumduction movement, as used to determine the hip joint centre position (star-arc movement). Five volunteers, characterised by a wide range of body mass indices (22-37), were investigated...
January 17, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28216981/real-case-of-primitive-embryonal-duodenal-carcinoma-in-a-young-man
#10
Julien Barbieux, Riccardo Memeo, Vito De Blasi, Sebastian Suciu, Vanina Faucher, Gerlinde Averous, Catherine Roy, Jacques Marescaux, Didier Mutter, Patrick Pessaux
We report here the case of a young man suffering from a rare germ cell tumour. The patient was a 25-year-old man who was referred to our centre for asthenia, stinging epigastric pain, and an iron deficiency anaemia. Gastroscopy revealed a circumferential vegetating lesion on the second portion of the duodenum. The lesion was indurated at the third portion of the duodenum, responsible for a tight stenosis. A computerized tomography-scan of the chest, abdomen and pelvis, and a pancreatic MRI showed a circumferential lesion with a bi-ductal dilatation (i...
January 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28181381/changes-in-penile-length-after-radical-prostatectomy-investigation-of-the-underlying-anatomical-mechanism
#11
Yoshifumi Kadono, Kazuaki Machioka, Kazufumi Nakashima, Masashi Iijima, Kazuyoshi Shigehara, Takahiro Nohara, Kazutaka Narimoto, Kouji Izumi, Yasuhide Kitagawa, Hiroyuki Konaka, Toshifumi Gabata, Atsushi Mizokami
OBJECTIVE: To measure changes in penile length (PL) over time before and after radical prostatectomy (RP), and to investigate the underlying mechanisms for these changes. PATIENTS AND METHODS: The stretched PL (SPL) of 102 patients was measured before, 10 days after, and at 1, 3, 6, 9, 12, 18 and 24 months after RP. The perpendicular distance from the distal end of the membranous urethra to the midline of the pelvic outlet was measured on mid-sagittal magnetic resonance imaging (MRI) slice at three time points: preoperatively; 10 days after RP; and 12 months after RP...
February 8, 2017: BJU International
https://www.readbyqxmd.com/read/28163853/bilateral-cryptorchidism-a-rare-presentation-for-persistent-m%C3%A3-llerian-duct-syndrome
#12
Abdullah Al-Faris, Mosleh Jabari, Mohammed Al-Sayed, Hassan Al-Shehri
Persistent Müllerian duct syndrome (PMDS) is a rare, sex-limited, autosomal recessive disorder representing male pseudo-hermaphroditism. It is observed in males with the presence of female reproductive organs such as the uterus, cervix, and bilateral fallopian tubes along with normally developed male reproductive organs. It generally occurs during embryogenesis due to mutation in anti-Müllerian hormone (AMH) gene, i.e., AMH gene or AMH receptor (AMHR2) gene. The present case reports a male infant with inflammation in the right groin who was admitted to Security Forces Hospital in 2015...
December 2016: Electronic Physician
https://www.readbyqxmd.com/read/28162865/what-to-expect-when-they-are-expecting-magnetic-resonance-imaging-of-the-acute-abdomen-and-pelvis-in-pregnancy
#13
REVIEW
Hemang M Kotecha, Lacey J McIntosh, Hao S Lo, Byron Y Chen, Carolyn S Dupuis
In this article, we discuss the challenges in the diagnosis of acute abdominopelvic pain in pregnant patients, role of imaging, and advantages of MRI over other modalities. Methods consist of pictorial review. We review the differential diagnoses and illustrate the MRI findings in pregnant patients with acute abdominopelvic pain, including gastrointestinal, gynecologic, urologic, and vascular etiologies.
December 15, 2016: Current Problems in Diagnostic Radiology
https://www.readbyqxmd.com/read/28133087/-a-case-of-carcinoma-associated-with-an-anal-fistula-repaired-using-a-hatchet-flap-after-neoadjuvant-chemoradiotherapy
#14
Masatoshi Kuroda, Eiji Ikeda, Nobuji Yokoyama, Masaichi Kenmotsu, Shoji Takagi, Toshihisa Yamano
The patient was a 53-year-old man who complained of perianal pain. He had a 20-year history of an anal fistula. There was a 10 cm tumor with mucin-like discharge on the left side of the anus. His CEA level was high, at 7.3 ng/mL, and T2-weighted MRI revealed a multilocular cystic tumor with high signal intensity. The second biopsy result indicated mucinous adenocarcinoma. We performed neoadjuvant chemoradiotherapy. The chemotherapy regimen was TS-1 with radiation therapy, along with 4-port irradiation(50.4 Gy)of the primary tumor, located at the interior of the pelvis and inguinal lymph nodes...
November 2016: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28125816/comparative-anatomy-of-the-ovine-and-female-pelvis
#15
Iva Urbankova, Katarina Vdoviakova, Rita Rynkevic, Nikhil Sindhwani, Dries Deprest, Andrew Feola, Paul Herijgers, Ladislav Krofta, Jan Deprest
BACKGROUND: Pelvic organ prolapse affects half of vaginally parous women. Several animal models are used to study its pathophysiology and treatment. Sheep are interesting because they develop spontaneously prolapse with similar risk factors as women and can be used for vaginal surgery. This study describes ovine pelvis anatomy and compares it to women's pelvis to provide anatomical tools for translational researchers. METHODS: MRI, pelvic dissections, and histology were used for detailed macro- and microscopic analysis of relevant anatomical structures in 6 nulliparous ewes...
January 27, 2017: Gynecologic and Obstetric Investigation
https://www.readbyqxmd.com/read/28124535/does-mri-help-in-the-pre-operative-evaluation-of-pelvic-fracture-urethral-distraction-defect-a-pilot-study
#16
Rajadoss Muthukrishna Pandian, Nirmal Thampi John, Anu Eapen, B Antonisamy, Antony Devasia, Nitin Kekre
OBJECTIVES: To study the usefulness of MRI in preoperative evaluation of PFUDD. Can MRI provide additional information on urethral distraction defect (UDD) and cause of erectile dysfunction (ED)? MATERIALS AND METHODS: In this prospective study, consecutive male patients presenting with PFUDD were included from Feb 2011 till Dec 2012. Those with traumatic spinal cord injury and pre-existing ED were excluded. Patients were assessed using IIEF questionnaire, retrograde urethrogram and micturating cystourethrogram (RGU+MCU) and MRI pelvis...
January 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/28124074/mri-visible-fe3o4-polypropylene-mesh-3d-reconstruction-of-spatial-relation-to-bony-pelvis-and-neurovascular-structures
#17
Luyun Chen, Florian Lenz, Céline D Alt, Christof Sohn, John O De Lancey, Kerstin A Brocker
INTRODUCTION AND HYPOTHESIS: To demonstrate mesh magnetic resonance imaging (MRI) visibility in living women, the feasibility of reconstructing the full mesh course in 3D, and to document its spatial relationship to pelvic anatomical structures. METHODS: This is a proof of concept study of three patients from a prospective multi-center trial evaluating women with anterior vaginal mesh repair using a MRI-visible Fe3O4 polypropylene implant for pelvic floor reconstruction...
January 25, 2017: International Urogynecology Journal
https://www.readbyqxmd.com/read/28112410/hybrid-zte-dixon-mr-based-attenuation-correction-for-quantitative-uptake-estimation-of-pelvic-lesions-in-pet-mri
#18
Andrew P Leynes, Jaewon Yang, Dattesh D Shanbhag, Sandeep S Kaushik, Youngho Seo, Thomas A Hope, Florian Wiesinger, Peder E Z Larson
PURPOSE: This study introduces a new hybrid ZTE/Dixon MR-based attenuation correction (MRAC) method including bone density estimation for PET/MRI and quantifies the effects of bone attenuation on metastatic lesion uptake in the pelvis. METHODS: Six patients with pelvic lesions were scanned using fluorodeoxyglucose (18F-FDG) in an integrated time-of-flight (TOF) PET/MRI system. For PET attenuation correction, MR imaging consisted of two-point Dixon and zero echo-time (ZTE) pulse sequences...
March 2017: Medical Physics
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
#19
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
#20
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
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