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https://www.readbyqxmd.com/read/28241538/characterization-of-digital-dispersive-spectrometers-by-low-coherence-interferometry
#1
Ó Martínez-Matos, C Rickenstorff, S Zamora, J G Izquierdo, P Vaveliuk
We propose a procedure to determine the spectral response of digital dispersive spectrometers without previous knowledge of any parameter of the system. The method consists of applying the Fourier transform spectroscopy technique to each pixel of the detection plane, a CCD camera, to obtain its individual spectral response. From this simple procedure, the system-point spread function and the effect of the finite pixel width are taken into account giving rise to a response matrix that fully characterizes the spectrometer...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28241305/dry-coupling-for-whole-body-small-animal-photoacoustic-computed-tomography
#2
Chenghung Yeh, Lei Li, Liren Zhu, Jun Xia, Chiye Li, Wanyi Chen, Alejandro Garcia-Uribe, Konstantin I Maslov, Lihong V Wang
No abstract text is available yet for this article.
April 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28241231/effect-of-testosterone-treatment-on-volumetric-bone-density-and-strength-in-older-men-with-low-testosterone-a-controlled-clinical-trial
#3
Peter J Snyder, David L Kopperdahl, Alisa J Stephens-Shields, Susan S Ellenberg, Jane A Cauley, Kristine E Ensrud, Cora E Lewis, Elizabeth Barrett-Connor, Ann V Schwartz, David C Lee, Shalender Bhasin, Glenn R Cunningham, Thomas M Gill, Alvin M Matsumoto, Ronald S Swerdloff, Shehzad Basaria, Susan J Diem, Christina Wang, Xiaoling Hou, Denise Cifelli, Darlene Dougar, Bret Zeldow, Douglas C Bauer, Tony M Keaveny
Importance: As men age, they experience decreased serum testosterone concentrations, decreased bone mineral density (BMD), and increased risk of fracture. Objective: To determine whether testosterone treatment of older men with low testosterone increases volumetric BMD (vBMD) and estimated bone strength. Design, Setting, and Participants: Placebo-controlled, double-blind trial with treatment allocation by minimization at 9 US academic medical centers of men 65 years or older with 2 testosterone concentrations averaging less than 275 ng/L participating in the Testosterone Trials from December 2011 to June 2014...
February 21, 2017: JAMA Internal Medicine
https://www.readbyqxmd.com/read/28241114/a-novel-approach-to-improve-efficiency-of-block-freeze-concentration-using-ice-nucleation-proteins-with-altered-ice-morphology
#4
Jue Jin, Edward J Yurkow, Derek Adler, Tung-Ching Lee
Freeze concentration is a separation process with high success in product quality. The remaining challenge is to achieve high efficiency with low cost. This study aims to evaluate the potential of using ice nucleation proteins (INPs) as an effective method to improve the efficiency of block freeze concentration while also exploring the related mechanism of ice morphology. Our results show that INPs are able to significantly improve the efficiency of block freeze concentration in a desalination model. Using this experimental system, we estimate that approximately 50% of the energy cost can be saved by the inclusion of INPs in desalination cycles while still meeting the EPA standard of drinking water (<500ppm)...
February 27, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28241001/-maxillary-mucocele-after-an-orthognathic-surgery-case-report
#5
Vicente Alfonso Carrillo Andrades, Bernardita Claudia Carrillo Venezian
Mucoceles are not often found in the maxillary sinus, and is a rare surgery complication, in this case, orthognathic. This review describes a mucocele that partially occupies the right maxillary sinus, causing a chronic nasal obstruction. This is the case of a 44 year-old female patient, which after 12 years of several orthognathic surgeries, presents facial pain and right nasal obstruction. The paranasal sinus computed tomography reveals a mass with liquid content that occupies the lower part of the right maxillary sinus and compromises the right nasal cavity...
January 16, 2017: Medwave
https://www.readbyqxmd.com/read/28240959/comparison-of-elastography-contrast-enhanced-ultrasonography-and-computed-tomography-for-assessment-of-lesion-margin-after-radiofrequency-ablation-in-livers-of-healthy-dogs
#6
Sohyeon Moon, Seungjo Park, Sang-Kwon Lee, Byunggyu Cheon, Sunghwa Hong, Hyun Cho, Jun-Gyu Park, Mia Madel Alfajaro, Kyoung-Oh Cho, Dong Woo, Jihye Choi
OBJECTIVE To assess by use of various diagnostic imaging modalities acute changes in livers of healthy dogs after radiofrequency ablation (RFA) and determine the capability of each imaging modality to monitor ablation lesion changes. ANIMALS 6 healthy Beagles. PROCEDURES 12 ablation lesions were created in the liver of the dogs (2 lesions/dog). Ablation lesions were evaluated by use of conventional ultrasonography, strain elastography, and contrast-enhanced ultrasonography immediately after (time 0), 30 to 60 minutes after, and 3 days after RFA, and by use of CT 30 minutes and 3 days after RFA...
March 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28240951/effect-of-position-and-time-held-in-that-position-on-ground-glass-opacity-in-computed-tomography-images-of-dogs
#7
Sang-Kwon Lee, Seungjo Park, Byunggyu Cheon, Sohyeon Moon, Sunghwa Hong, Hyun Cho, Dongwoo Chang, Jihye Choi
OBJECTIVE To evaluate effects of position, time in that position, and positive end-expiratory pressure on ground-glass opacity caused by physiologic atelectasis on lung CT images and to determine effects of recumbency position before CT. ANIMALS 6 healthy Beagles. PROCEDURES In a crossover study, dogs were placed in 4 positions (sternal, dorsal, right lateral, and left lateral recumbency) for 2 holding times (30 and 60 minutes). Dogs were then repositioned in sternal recumbency, and CT was performed at 2 positive end-expiratory pressures (0 and 15 mm Hg)...
March 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28240795/combining-hyperechoic-aggregates-and-the-double-contour-sign-increases-the-sensitivity-of-sonography-for-detection-of-monosodium-urate-deposits-in-gout
#8
Liang Zhu, Shengzhou Zheng, Wenwen Wang, Qijing Zhou, Huaxiang Wu
OBJECTIVES: To compare the sensitivities of individual and combined sonography of hyperechoic aggregates and the double-contour sign in detecting monosodium urate (MSU) crystal deposits in gouty joints. METHODS: Monosodium urate crystal deposits in symptomatic and contralateral asymptomatic joints of 70 patients with acute gout were evaluated by sonography of hyperechoic aggregates and the double-contour sign individually and in combination. All patients with acute gout in this study had at least 1 symptomatic joint with MSU deposits determined by dual-energy computed tomography...
February 27, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28240640/comparison-of-270-versus-320-mg-i-ml-of-iodixanol-in-1-image-assessment-of-both-renal-arteries-and-veins-with-dual-energy-spectral-ct-imaging-in-late-arterial-phase-and-their-influence-on-renal-function
#9
Kefeng Zhou, Jian He, Feng Qu, Haijian Fan, Yi Ma, Tingting Shi, Zhengyang Zhou, Bin Zhu
OBJECTIVE: The objective of this study was to compare the image quality of renal arteries and veins with dual-energy spectral computed tomography (CT) imaging in late arterial phase using 270 and 320 mg I/mL of iodixanol and their influence on renal function. METHODS: A total of 1062 patients underwent renal CT angiography with 270 or 320 mg I/mL of iodixanol with dual-energy spectral CT imaging in late arterial phase. Image quality and their influence on renal function were compared...
February 24, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28240639/diaphragmatic-hernia-after-living-donor-right-hepatectomy-an-important-late-donor-complication
#10
Ji-Won Oh, Soon Nam Oh, Seung Eun Jung, Jae Young Byun
OBJECTIVE: This study was performed to evaluate the incidence and clinical outcome of diaphragmatic hernia after living-donor right hepatectomy. METHODS: Three hundred thirty-six patients (202 men, 134 women; mean age, 37.6 years) who underwent abdominal computed tomography (CT) after right donor hepatectomy were enrolled in this study. The CT images and the electronic medical records were reviewed. We evaluated the associations between diaphragmatic hernia and patient characteristics...
February 24, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28240638/measurement-of-myocardial-extracellular-volume-fraction-from-iodine-density-images-using-single-source-dual-energy-computed-tomography-a-feasibility-study
#11
Yasutoshi Ohta, Shinichiro Kitao, Tomomi Watanabe, Natsuko Mukai, Junichi Kishimoto, Kazuhiro Yamamoto, Toshihide Ogawa
OBJECTIVE: The aims of this study were to develop and validate an iodine density method for the quantification of myocardial extracellular volume (ECV) fraction using single-source, dual-energy computed tomography. METHODS: Extracellular volume measurements were carried out in 40 subjects (20 patients with heart failure, 20 control subjects) using single-source, dual-energy computed tomography. Subtraction-derived ECVs (subECVs) were computed by subtracting precontrast from delayed images...
February 24, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28240636/computed-tomography-pulmonary-angiogram-dynamic-parameter-correlation-with-pulmonary-pressure-and-pulmonary-hypertension-etiologies
#12
Yoel Siegel, Drew Bleicher, Michael Kurt Gordon, Debra Fertel
OBJECTIVE: Pulmonary hypertension (PH) is caused by etiologies that differ in pathophysiology. Patients with undiagnosed PH may have a computed tomography pulmonary angiography (CTPA) scan during workup. Static measurements on computed tomography correlate with PH; however, dynamic parameters have received less attention. We studied the correlation between CTPA dynamic parameters and PH and assessed whether these parameters differ among PH etiologies. We also propose a method for PH screening...
February 24, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28240634/torsed-and-nontorsed-inguinal-undescended-testis-comparison-of-computed-tomography-findings
#13
Eyal Klang, Nadin Kanaan, Michalle Soudack, Yeruham Kleinbaum, Zehava Heiman, Steve Raskin, Marianne Michal Amitai
OBJECTIVE: The aim of this study was to compare the computed tomography imaging features of a torsed inguinal testis with nontorsed inguinal testes. METHODS: Computed tomography scans of patients with undescended testes were retrospectively collected (2011-2016). Imaging features of nontorsed undescended testis were compared with a case of an inguinal torsed testis. Observations included location of the undescended testis, size (length × width) and texture of each testis, peritesticular findings, position of testicular vessels, and enhancement patterns...
February 24, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28240608/evaluation-of-extraction-site-dimensions-and-density-using-computed-tomography-treated-with-different-graft-materials-a-preliminary-study
#14
Filiz Hyusein Cavdar, Huseyin Gencay Keceli, Hasan Hatipoglu, Burak Demiralp, Feriha Caglayan
PURPOSE: The preliminary human study was designed to evaluate extraction site changes using CT after socket preservation (SP) with different materials. MATERIALS AND METHODS: Fifty-two sockets from 17 Turkish individuals (8 women and 9 men; mean age 44.70 ± 9.99 years) localized at the maxillary anterior area were treated with demineralized bone matrix + collagen membrane (CM) (N = 14), hydroxyapatite bone substitute (HBS) + CM (N = 14), CM (N = 13), or left empty (N = 11)...
February 24, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28240508/it-s-not-inside-it-s-on-top-an-unusual-cause-of-right-iliac-fossa-pain
#15
N Singh, M Govender
Rectus sheath haematoma (RSH) is an uncommon cause of acute abdominal pain, but can mimic a variety of acute surgical conditions. Computed tomography (CT) provides the diagnosis and avoids unnecessary procedures.
June 2016: South African Journal of Surgery. Suid-Afrikaanse Tydskrif Vir Chirurgie
https://www.readbyqxmd.com/read/28240507/a-pelvic-loose-body-tumour-causing-urinary-symptoms-in-a-73-year-old-man
#16
T Rosic, V Khumalo, D G Nethathe
Giant peritoneal loose bodies are very rare. Only a few cases have been reported in the literature. The mechanism of their formation is currently unknown. However, the hypothesis is that a detached appendix epiploicae becomes calcified over time in the abdominal cavity. We present a case of a 73-year-old man who presented with urinary symptoms. Computed tomography (CT) of the abdomen and pelvis revealed a well circumscribed mass in the pelvis. A firm egg-shaped mass was excised laparoscopically. Histology confirmed a giant loose peritoneal body...
June 2016: South African Journal of Surgery. Suid-Afrikaanse Tydskrif Vir Chirurgie
https://www.readbyqxmd.com/read/28240501/role-of-focused-assessment-with-sonography-for-trauma-as-a-screening-tool-for-blunt-abdominal-trauma-in-young-children-after-high-energy-trauma
#17
W Tummers, J van Schuppen, H Langeveld, J Wilde, E Banderker, A van As
BACKGROUND: The objective of the study was to review the utility of focused assessement with sonography for trauma (FAST) as a screening tool for blunt abdominal trauma (BAT) in children involved in high energy trauma (HET), and to determine whether a FAST could replace computed tomography (CT) in clinical decision-making regarding paediatric BAT. METHOD: Children presented at the Trauma Unit of the Red Cross War Memorial Children's Hospital, Cape Town, after HET, and underwent both a physical examination and a FAST...
June 2016: South African Journal of Surgery. Suid-Afrikaanse Tydskrif Vir Chirurgie
https://www.readbyqxmd.com/read/28240462/laparoscopic-management-of-hydatid-cyst-of-the-liver
#18
Y Yağmur, S Akbulut, S Gümüş, M Babür, M A Can
BACKGROUND: Hydatid liver disease management has evolved from traditional operative approaches to the increasing application of laparoscopic treatments. We aimed to prospectively assess the early outcomes of laparoscopic treatment at our institution. PATIENTS AND METHODS: Forty-four patients with hydatid disease of liver were screened with ultrasonography and computed tomography of the abdomen to exclude Gharbi type V cysts. The distribution of cyst sizes was: 1-4 cm, 10; 5-10 cm, 24; 10-15 cm, 8; > 15 cm, 2 patients...
September 2016: South African Journal of Surgery. Suid-Afrikaanse Tydskrif Vir Chirurgie
https://www.readbyqxmd.com/read/28240373/the-effect-of-simulated-metastatic-lesions-on-the-biomechanical-behavior-of-the-proximal-femur
#19
Emir Benca, Andreas Reisinger, Janina M Patsch, Lena Hirtler, Alexander Synek, Sandra Stenicka, Reinhard Windhager, Winfried Mayr, Dieter H Pahr
Pathologic fractures of femora in patients with metastatic cancer are associated with high morbidity and mortality. Prediction of impending fractures is based on unspecific clinical criteria or past clinician's experience, which leads to underestimation or overtreatment. The aim of this study was to investigate the effect of the site of metastatic lesions on biomechanical behavior of the proximal femur. Sixteen pairs of human femora were scanned with quantitative computed tomography (QCT) to asses bone mineral density...
February 27, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28240321/selection-for-oil-content-during-soybean-domestication-revealed-by-x-ray-tomography-of-ancient-beans
#20
Yunbing Zong, Shengkun Yao, Gary W Crawford, Hui Fang, Jianfeng Lang, Jiadong Fan, Zhibin Sun, Yang Liu, Jianhua Zhang, Xiulan Duan, Guangzhao Zhou, Tiqiao Xiao, Fengshi Luan, Qing Wang, Xuexiang Chen, Huaidong Jiang
When and under what circumstances domestication related traits evolved in soybean (Glycine max) is not well understood. Seed size has been a focus of archaeological attention because increased soybean seed weight/size is a trait that distinguishes most modern soybeans from their ancestors; however, archaeological seed size analysis has had limited success. Modern domesticated soybean has a significantly higher oil content than its wild counterpart so oil content is potentially a source of new insight into soybean domestication...
February 27, 2017: Scientific Reports
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