keyword
MENU ▼
Read by QxMD icon Read
search

Hounsfield Units (HU)

keyword
https://www.readbyqxmd.com/read/28437193/evaluation-of-the-effects-of-photobiomodulation-on-biomechanical-properties-and-hounsfield-unit-of-partial-osteotomy-healing-in-an-experimental-rat-model-of-type-i-diabetes-and-osteoporosis
#1
Ataroalsadat Mostafavinia, Reza Ahadi, Mohammadamin Abdollahifar, Seyed Kamran Ghorishi, Ali Jalalifirouzkouhi, Mohammad Bayat
BACKGROUND: Pulsed wave (PW) lasers exhibit biostimulatory effects on fractures in healthy and diabetic animals. OBJECTIVE: This study aims to assess the effects of photobiomodulation on bone strength and Hounsfield unit (HU) for repair of a bone defect in an experimental rat model of type I diabetes mellitus (TIDM) and osteoporosis (OP). METHODS: We divided 30 female rats into six groups of n = 5 per group: (1) ovariectomy (OVX) control, (2) OVX + PW laser and no TIDM, (3) OVX control + TIDM, (4) OVX + TIDM + PW laser, (5) OVX + TIDM + alendronate, and (6) OVX + TIDM + PW laser + alendronate...
February 22, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28437189/metformin-attenuates-radiation-induced-pulmonary-fibrosis-in-a-murine-model
#2
Jian Wang, Ye Wang, Jun Han, Hong Mei, Dandan Yu, Qian Ding, Tao Zhang, Gang Wu, Gang Peng, Zhenyu Lin
While radiotherapy continues to be a major cancer treatment option, its dose-limiting side effects, such as pulmonary fibrosis, severely impair the quality of life in these patients. In this study, we evaluated the radioprotective effects of metformin, a commonly used biguanide antidiabetic medication, in a murine model of pulmonary damage. Sprague Dawley(®) rats received whole lung 20 Gy irradiation with or without metformin treatment. Computed tomography (CT) was performed and Hounsfield units (HU) were determined during the observation period...
April 24, 2017: Radiation Research
https://www.readbyqxmd.com/read/28427913/predicting-the-stone-composition-of-children-preoperatively-by-hounsfield-unit-detection-on-non-contrast-computed-tomography
#3
Mesut Altan, Burak Çitamak, Ali Cansu Bozaci, Altan Güneş, Hasan Serkan Doğan, Mithat Haliloğlu, Serdar Tekgül
INTRODUCTION: Many studies have been performed on adult patients to reveal the relationship between Hounsfield unit (HU) value and composition of stone, but none have focused on childhood. OBJECTIVE: We aimed to predict stone composition by HU properties in pre-intervention non-contrast computed tomography (NCCT) in children. This could help to orient patients towards more successful interventions. MATERIALS AND METHODS: Data of 94 children, whose pre-intervention NCCT and post-interventional stone analysis were available were included...
March 31, 2017: Journal of Pediatric Urology
https://www.readbyqxmd.com/read/28420889/evaluation-of-urinary-stone-composition-and-differentiation-between-urinary-stones-and-phleboliths-using-single-source-dual-energy-computed-tomography
#4
Nanako Ogawa, Shuhei Sato, Kentaro Ida, Katsuya Kato, Yuichi Ariyoshi, Koichiro Wada, Yasutomo Nasu, Susumu Kanazawa
The aim of this study was to investigate the utility of single-source dual-energy computed tomography (SS-DECT) composition analysis in characterizing different types of urinary stones and differentiating them from phleboliths. This study included 29 patients with urinary stones who were scheduled for surgery. All patients were scanned, first using single-energy computed tomography acquisition and then DECT acquisition on SS-DECT. Dual-energy data were archived to a Gemstone spectral imaging (GSI) viewer (GE Healthcare, Milwaukee, WI, USA)...
April 2017: Acta Medica Okayama
https://www.readbyqxmd.com/read/28419040/measurement-of-distal-ulnar-hounsfield-units-accurately-predicts-bone-mineral-density-of-the-forearm
#5
Scott C Wagner, Theodora C Dworak, Patrick D Grimm, George C Balazs, Scott M Tintle
BACKGROUND: Hounsfield unit (HU) measurement obtained from computed tomography (CT) scans of the wrist is a potential new screening method for low bone mineral density (BMD). We hypothesized that HU measurements of the ulnar head obtained from CT scans would correlate with BMD assessed with dual x-ray absorptiometry (DXA) scans of the forearm. METHODS: Patients with both upper-extremity CT and DXA scans performed at a single institution were included in the study...
April 19, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28412104/cement-stress-predictions-after-anatomic-total-shoulder-arthroplasty-are-correlated-with-preoperative-glenoid-bone-quality
#6
Alexandre Terrier, Raphaël Obrist, Fabio Becce, Alain Farron
HYPOTHESIS: We hypothesized that biomechanical parameters typically associated with glenoid implant failure after anatomic total shoulder arthroplasty (aTSA) would be correlated with preoperative glenoid bone quality. METHODS: We developed an objective automated method to quantify preoperative glenoid bone quality in different volumes of interest (VOIs): cortical bone, subchondral cortical plate, subchondral bone after reaming, subchondral trabecular bone, and successive layers of trabecular bone...
April 12, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28405830/low-yield-of-ventilation-and-perfusion-imaging-for-the-evaluation-of-pulmonary-embolism-after-indeterminate-ct-pulmonary-angiography
#7
Brian R Curtis, Mougnyan Cox, Michael Poplawski, Andrej Lyshchik
PURPOSE: Ventilation and perfusion (VQ) imaging is common following suboptimal CT pulmonary angiogram (CTPA) for pulmonary embolism (PE) evaluation; however, the results of this diagnostic pathway are unclear. The purpose of our study is to determine the incidence of PE diagnosed on VQ scans performed in patients with suboptimal CTPAs. METHODS: One hundred twenty-two suboptimal CTPAs with subsequent VQ scans within 1 week were retrospectively identified. VQ reports utilizing modified ​prospective investigation of pulmonary embolism diagnosis (PIOPED) and prospective investigative study of acute pulmonary embolism diagnosis (PISAPED) criteria were evaluated for presence of PE; intermediate probability, high probability, and PE present were considered PE positive...
April 12, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28396728/computed-tomography-pulmonary-angiography-using-a-20-reduction-in-contrast-medium-dose-delivered-in-a-multiphasic-injection
#8
Mitchell Chen, Gaith Mattar, Jamal A Abdulkarim
AIM: To evaluate the feasibility of reducing the dose of iodinated contrast agent in computed tomography pulmonary angiography (CTPA). METHODS: One hundred and twenty-seven patients clinically suspected of having pulmonary embolism underwent spiral CTPA, out of whom fifty-seven received 75 mL and the remaining seventy a lower dose of 60 mL of contrast agent. Both doses were administered in a multiphasic injection. A minimum opacification threshold of 250 Hounsfield units (HU) in the main pulmonary artery is used for assessing the technical adequacy of the scans...
March 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/28396126/improved-estimation-of-coronary-plaque-and-luminal-attenuation-using-a-vendor-specific-model-based-iterative-reconstruction-algorithm-in-contrast-enhanced-ct-coronary-angiography
#9
Yoshinori Funama, Daisuke Utsunomiya, Kenichiro Hirata, Katsuyuki Taguchi, Takeshi Nakaura, Seitaro Oda, Masafumi Kidoh, Hideaki Yuki, Yasuyuki Yamashita
RATIONALE AND OBJECTIVES: To investigate the stabilities of plaque attenuation and coronary lumen for different plaque types, stenotic degrees, lumen densities, and reconstruction methods using coronary vessel phantoms and the visualization of coronary plaques in clinical patients through coronary computed tomography (CT) angiography. MATERIALS AND METHODS: We performed 320-detector volume scanning of vessel tubes with stenosis and a tube without stenosis using three types of plaque CT numbers...
April 7, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28393820/comparison-of-gray-values-of-cone-beam-computed-tomography-with-hounsfield-units-of-multislice-computed-tomography-an-in-vitro-study
#10
Sanjana Patrick, N Praveen Birur, Keerthi Gurushanth, A Shubhasini Raghavan, Shubha Gurudath
PURPOSE: Hounsfield unit (HU) provides a quantitative evaluation of bone density. The assessment of bone density is essential for successful treatment plan. Although, multislice computed tomography (MSCT) is considered as gold standard in evaluating bone density, cone-beam computed tomography (CBCT) is frequently used in dentomaxillofacial imaging due to lower radiation dose, less complex device, and images with satisfactory resolution. AIMS AND OBJECTIVES: The aim of this study is to determine and compare the gray value and HU value of hypodense and hyperdense structures on CBCT and MSCT, respectively...
January 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/28391428/do-clinical-outcomes-correlate-with-bone-density-after-open-reduction-and-internal-fixation-of-tibial-plateau-fractures
#11
Elizabeth Gausden, Matthew R Garner, Peter D Fabricant, Stephen J Warner, Andre D Shaffer, Dean G Lorich
INTRODUCTION: The operative management of tibial plateau fractures in elderly patients has historically led to inconsistent results, and these clinical outcomes were thought to be associated with poor bone quality often in elderly patients. The goal of this study was to investigate the relationship between bone density and subjective clinical outcome scores after open reduction and internal fixation of tibial plateau fractures. MATERIALS AND METHODS: This is a retrospective cohort study from a single-surgeon conducted at an Academic, Level 1 Trauma Center...
April 8, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28387962/comparative-investigation-of-bone-mineral-density-using-ct-and-dexa-in-a-canine-femoral-model
#12
Karin Lucas, Bernd-Arno Behrens, Ingo Nolte, Vladimir Galindo-Zamora, Stefanie Betancur, Amer Almohallami, Anas Bouguecha, Ayman Mostafa, Matthias Lerch, Christina Stukenborg-Colsman, Patrick Wefstaedt
Bone density measurements using computed tomography (CT) instead of dual-energy X-ray absorptiometry (DEXA) are currently of great interest in human and veterinary medical research as it would be beneficial to use CT scans obtained for other indications also for determining bone density. For Hounsfield units (HU) measured with CT in specific regions of interests (ROIs) in one or several slice/s a corrrelation with bone mineral density (BMD) measured by DEXA in humans and dogs of between 0.44 and 0.77 is reported in the literature...
April 7, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28385725/impact-of-image-reconstruction-parameters-when-using-3d-dsa-reconstructions-to-measure-intracranial-aneurysms
#13
Katrina L Ruedinger, David R Rutkowski, Sebastian Schafer, Alejandro Roldán-Alzate, Erick L Oberstar, Charles Strother
BACKGROUND AND PURPOSE: Safe and effective use of newly developed devices for aneurysm treatment requires the ability to make accurate measurements in the angiographic suite. Our purpose was to determine the parameters that optimize the geometric accuracy of three-dimensional (3D) vascular reconstructions. METHODS: An in vitro flow model consisting of a peristaltic pump, plastic tubing, and 3D printed patient-specific aneurysm models was used to simulate blood flow in an intracranial aneurysm...
April 6, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28378320/the-impact-of-smart-metal-artefact-reduction-algorithm-for-use-in-radiotherapy-treatment-planning
#14
Connor Guilfoile, Peter Rampant, Michael House
The presence of metal artefacts in computed tomography (CT) create issues in radiation oncology. The loss of anatomical information and incorrect Hounsfield unit (HU) values produce inaccuracies in dose calculations, providing suboptimal patient treatment. Metal artefact reduction (MAR) algorithms were developed to combat these problems. This study provides a qualitative and quantitative analysis of the "Smart MAR" software (General Electric Healthcare, Chicago, IL, USA), determining its usefulness in a clinical setting...
April 4, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28376262/the-effects-of-iterative-reconstruction-and-kernel-selection-on-quantitative-computed-tomography-measures-of-lung-density
#15
Alfonso Rodriguez, Frank N Ranallo, Philip F Judy, Sean B Fain
PURPOSE: To determine the effects of iterative reconstruction (IR) and high frequency kernels on quantitative computed tomography (qCT) density measures at reduced X-ray dose. MATERIALS AND METHODS: The COPDGene 2 Phantom (CTP 698, The Phantom Laboratory, Salem, NY) with four embedded lung mimicking foam densities (12lb, 20lb, and 4lb), as well as water, air, and acrylic reference inserts was imaged using a GE 64 slice CT750 HD scanner in helical mode with four current-time products ranging from 12-100 mAs...
April 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28372786/clinical-application-of-effective-atomic-number-for-classifying-non-calcified-coronary-plaques-by-dual-energy-computed-tomography
#16
Shun Nakajima, Hiroyuki Ito, Tetsuya Mitsuhashi, Yutaka Kubo, Kazuhiro Matsui, Isao Tanaka, Rika Fukui, Hisako Omori, Takashi Nakaoka, Hiroshi Sakura, Eiko Ueno, Haruhiko Machida
BACKGROUND AND AIMS: Coronary computed tomography (CT) angiography allows non-invasive classification of non-calcified coronary plaques (NCCPs) based on Hounsfield unit (HU) values. This methodology, however, is somewhat limited for reliable classification of NCCPs. Therefore, we evaluated the effective atomic number (EAN) for classifying NCCPs by single-source dual-energy CT with fast tube voltage switching (SSDECT). METHODS: We prospectively enrolled 18 patients undergoing both SSDECT and intravascular ultrasonography (IVUS)...
March 21, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28358661/evaluation-of-the-effects-of-photobiomodulation-on-bone-healing-in-healthy-and-streptozotocin-induced-diabetes-in-rats
#17
Ataroalsadat Mostafavinia, Sara Razavi, Mohammadamin Abdollahifar, Abdollah Amini, Seyed Kamran Ghorishi, Fatemehalsadat Rezaei, Ramin Pouriran, Mohammad Bayat
OBJECTIVE: This study aimed to assess the effects of Photobiomodulation (PBM) with pulsed wave laser on Hounsfield unit (HU) and bone strength at a catabolic response (bone resorption) of a callus bone defect in healthy and streptozotocin (STZ)- induced type I diabetes mellitus (TI DM) in rats. BACKGROUND DATA: Conflicting results exist regarding the effect of PBM on bone healing in healthy and diabetic animals. MATERIALS AND METHODS: We randomly divided 20 adult female rats into the following groups: (1) control, no TI DM, and no PBM; (2) no TI DM and PBM; (3) TI DM and no PBM; and (4) TI DM and PBM...
March 30, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28345547/contrast-dose-and-radiation-dose-reduction-in-abdominal-enhanced-computerized-tomography-scans-with-single-phase-dual-energy-spectral-computerized-tomography-mode-for-children-with-solid-tumors
#18
Tong Yu, Jun Gao, Zhi-Min Liu, Qi-Feng Zhang, Yong Liu, Ling Jiang, Yun Peng
BACKGROUND: Contrast dose and radiation dose reduction in computerized tomography (CT) scan for adult has been explored successfully, but there have been few studies on the application of low-concentration contrast in pediatric abdominal CT examinations. This was a feasibility study on the use of dual-energy spectral imaging and adaptive statistical iterative reconstruction (ASiR) for the reduction of radiation dose and iodine contrast dose in pediatric abdominal CT patients with solid tumors...
April 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28342121/can-comprehensive-imaging-analysis-with-analytic-morphomics-and-geriatric-assessment-predict-serious-complications-in-patients-undergoing-pancreatic-surgery
#19
Andrew J Benjamin, Mary M Buschmann, Andrew Schneider, Brian A Derstine, Jeffrey F Friedman, Stewart C Wang, William Dale, Kevin K Roggin
We aimed to determine whether comprehensive imaging analysis with analytic morphomics (AM) enhances or replaces geriatric assessment (GA) in risk-stratifying pancreatic surgery patients. One hundred thirty-four pancreatic surgery patients were identified from a prospective cohort. Sixty-three patients in the cohort had preoperative CT scans in addition to comprehensive geriatric assessments. CT scans were processed using AM. Associations with National Surgical Quality Improvement Program (NSQIP) serious complications were evaluated using univariate analysis and robust elastic net modeling to obtain AUROC curves by adding AM and GA measures to our previously defined clinical base risk model (age, body mass index, American Society of Anesthesiologists classification, and Charlson comorbidity index)...
March 24, 2017: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/28341412/dorsal-muscle-attenuation-may-predict-failure-to-respond-to-interleukin-2-therapy-in-metastatic-renal-cell-carcinoma
#20
Bamidele Otemuyiwa, Brian A Derstine, Peng Zhang, Sandra L Wong, Michael S Sabel, Bruce G Redman, Stewart C Wang, Ajjai S Alva, Matthew S Davenport
RATIONALE AND OBJECTIVES: To explore whether the sarcopenia body type can help predict response to interleukin-2 (IL-2) therapy in metastatic renal cell carcinoma (RCC). MATERIALS AND METHODS: Institutional review board approval was obtained for this Health Insurance Portability and Accountability Act-compliant retrospective cohort study of 75 subjects with metastatic RCC who underwent pretreatment contrast-enhanced computed tomography within 1 year of initiating IL-2 therapy...
March 21, 2017: Academic Radiology
keyword
keyword
99653
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"