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Hounsfield Units (HU)

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https://www.readbyqxmd.com/read/29333117/baseline-tumor-lipiodol-uptake-after-transarterial-chemoembolization-for-hepatocellular-carcinoma-identification-of-a-threshold-value-predicting-tumor-recurrence
#1
Yusuke Matsui, Masahiro Horikawa, Younes Jahangiri Noudeh, John A Kaufman, Kenneth J Kolbeck, Khashayar Farsad
Background: The aim of the study was to evaluate the association between baseline Lipiodol uptake in hepatocellular carcinoma (HCC) after transarterial chemoembolization (TACE) with early tumor recurrence, and to identify a threshold baseline uptake value predicting tumor response. Patients and methods: A single-institution retrospective database of HCC treated with Lipiodol-TACE was reviewed. Forty-six tumors in 30 patients treated with a Lipiodol-chemotherapy emulsion and no additional particle embolization were included...
December 2017: Radiology and Oncology
https://www.readbyqxmd.com/read/29332161/the-computed-tomography-adrenal-wash-out-analysis-properly-classifies-cortisol-secreting-adrenocortical-adenomas
#2
Anne-Laure Humbert, Guillaume Lecoanet, Sophie Moog, Fehd Bouderraoui, Laurent Bresler, Jean-Michel Vignaud, Elodie Chevalier, Laurent Brunaud, Marc Klein, Thomas Cuny
PURPOSE: Adrenocortical lesions are characterized through imaging, hormonal and histopathological analysis. Our aim was to compare the radiological features of adrenocortical lesions with their cortisol-secreting status and histopathological Weiss score. METHODS: Seventy five patients operated between 2004 and 2016 in the University Hospital of Nancy for either adrenocortical carcinomas (ACC) or adrenocortical adenomas (ACA) were enrolled in this study. We collected cortisol parameters, Computed Tomography (CT) scans (unenhanced density, wash-out (WO) analysis) and 18F-Fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) datas...
January 13, 2018: Endocrine
https://www.readbyqxmd.com/read/29312867/quantitative-assessment-of-nonsolid-pulmonary-nodule-volume-with-computed-tomography-in-a-phantom-study
#3
Marios A Gavrielides, Benjamin P Berman, Mark Supanich, Kurt Schultz, Qin Li, Nicholas Petrick, Rongping Zeng, Jenifer Siegelman
Background: To assess the volumetric measurement of small (≤1 cm) nonsolid nodules with computed tomography (CT), focusing on the interaction of state of the art iterative reconstruction (IR) methods and dose with nodule densities, sizes, and shapes. Methods: Twelve synthetic nodules [5 and 10 mm in diameter, densities of -800, -630 and -10 Hounsfield units (HU), spherical and spiculated shapes] were scanned within an anthropomorphic phantom. Dose [computed tomography scan dose index (CTDIvol)] ranged from standard (4...
December 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29312727/clinical-features-diagnosis-and-thoracoscopic-surgical-treatment-of-thymic-cysts
#4
Xun Wang, Kezhong Chen, Xiao Li, Yun Li, Fan Yang, Jianfeng Li, Guanchao Jiang, Jun Liu, Jun Wang
Background: Thymic cysts are rare benign developmental anomalies and there is no consensus management for thymic cysts. The aim of this study was to disclose the efficacy of perioperative diagnosis for thymic cysts by chest computerized tomography (CT) and to elucidate the surgical procedure by video-assisted thoracic surgery (VATS) in the management of thymic cysts. Methods: We retrospectively reviewed 108 consecutive thymic cyst patients who underwent VATS at our institution between April 2001 and August 2015...
December 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29299352/a-semi-automated-assessment-of-sarcopenia-using-psoas-area-and-density-predicts-outcomes-after-pancreaticoduodenectomy-for-pancreatic-malignancy
#5
Jukes P Namm, Kiran H Thakrar, Chi-Hsiung Wang, Susan J Stocker, Malini D Sur, Jonathan Berlin, William Dale, Mark S Talamonti, Kevin K Roggin
Background: Sarcopenia has been associated with increased adverse outcomes after major abdominal surgery. Sarcopenia defined as decreased muscle volume or increased fatty infiltration may be a proxy for frailty. In conjunction with other preoperative clinical risk factors, radiographic measures of sarcopenia using both muscle size and density may enhance prediction of outcomes after pancreaticoduodenectomy (PD) for malignancy. Methods: Preoperative computed tomography (CT) scans of patients undergoing PD for malignancy were analyzed from a prospective pancreatic surgery database...
December 2017: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/29279943/assessment-of-alteration-in-liver-18f-fdg-uptake-due-to-steatosis-in-lymphoma-patients-and-its-impact-on-the-deauville-score
#6
Thibault Salomon, Catherine Nganoa, Anne-Claire Gac, Christophe Fruchart, Gandhi Damaj, Nicolas Aide, Charline Lasnon
AIM: Our aim was (1) to evaluate the prevalence of steatosis in lymphoma patients and its evolution during treatment; (2) to evaluate the impact of hepatic steatosis on 18F-FDG liver uptake; and (3) to study how hepatic steatosis affects the Deauville score (DS) for discriminating between responders and non-responders. METHODS: Over a 1-year period, 358 PET scans from 227 patients [122 diffuse large B cell lymphoma (DLBCL), 57 Hodgkin lymphoma (HL) and 48 Follicular lymphoma (FL)] referred for baseline (n = 143), interim (n = 79) and end-of-treatment (EoT, n = 136) PET scans were reviewed...
December 26, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29279821/submandibular-sialolithiasis-with-ct-and-scintigraphy-ct-values-and-salivary-gland-excretion-in-the-submandibular-glands
#7
Ichiro Ogura, Kazuhide Hayama, Mikiko Sue, Takaaki Oda, Yoshihiko Sasaki
Purpose: Sialolithiasis is one of the most prevalent large obstructive disorders of the submandibular glands. The aim of this study was to investigate submandibular sialolithiasis with computed tomography (CT) and scintigraphy, with a particular focus on the relationship between CT values of the submandibular glands and their excretion rate. Materials and Methods: Fifteen patients with submandibular sialolithiasis who underwent CT and salivary gland scintigraphy were included in this study...
December 2017: Imaging Science in Dentistry
https://www.readbyqxmd.com/read/29277886/the-respiratory-induced-kidney-motion-does-it-really-effect-the-shock-wave-lithotripsy
#8
Mehmet Ozgur Yucel, Serkan Ozcan, Gokhan Tirpan, Murat Bagcioglu, Arif Aydin, Arif Demirbas, Tolga Karakan
PURPOSE: To investigate the effect of respiratory induced kidney mobility on success of shock wave lithotripsy (SWL) with an electrohydraulic lithotripter. MATERIALS AND METHODS: Between May 2013 and April 2015, 158 patients underwent SWL treatment for kidney stones with an electrohydraulic lithotripter. The exclusion criteria were presence of a known metabolic disease (such as cystinuria), non-opaque stones, need for focusing with ultrasonography, abnormal habitus, urinary tract abnormalities, and inability to tolerate SWL until the end of the procedure...
December 25, 2017: Urology Journal
https://www.readbyqxmd.com/read/29277840/investigating-comparability-of-quantitative-computed-tomography-with-dual-energy-x-ray-absorptiometry-in-assessing-bone-mineral-density-of-patients-with-chronic-spinal-cord-injury
#9
Hamid Reza Haghighat Khah, Nahid Moradi, Taher Taheri, Morteza Sanei Taheri, Seyed Mansoor Rayegani
STUDY DESIGN: Psychometric study using retrospectively collected data. OBJECTIVES: We investigated the comparability of quantitative computed tomography (qCT) in assessing bone mineral density (BMD) with dual energy X-ray absorptiometry (DXA). We evaluated how well previously suggested normal values for spinal Hounsfield units (HU) correlated with routine DXA results in patients with chronic spinal cord injury (SCI). Furthermore, we investigated inter/intra-observer reliability of measuring HU in the spine...
December 26, 2017: Spinal Cord
https://www.readbyqxmd.com/read/29275940/how-well-does-dual-energy-ct-with-fast-kilovoltage-switching-quantify-ct-number-and-iodine-and-calcium-concentrations
#10
Shingo Ohira, Tsukasa Karino, Yoshihiro Ueda, Yuya Nitta, Naoyuki Kanayama, Masayoshi Miyazaki, Masahiko Koizumi, Teruki Teshima
RATIONALE AND OBJECTIVES: Because it is imperative for understanding the performance of dual-energy computed tomography scanner to determine clinical diagnosis, we aimed to assess the accuracy of quantitative measurements using dual-energy computed tomography with fast kilovoltage switching. MATERIALS AND METHODS: Quantitative measurements were performed for 16 reference materials (physical density, 0.965-1.550 g/cm3; diameter of rod, 2.0-28.5 mm; iodine concentration, 2-15 mg/mL; and calcium concentration, 50-300 mg/mL) with varying scanning settings, and the measured values were compared to their theoretical values...
December 21, 2017: Academic Radiology
https://www.readbyqxmd.com/read/29260301/regional-hounsfield-unit-measurement-of-screw-trajectory-for-predicting-pedicle-screw-fixation-using-cortical-bone-trajectory-a-retrospective-cohort-study
#11
Keitaro Matsukawa, Yuichiro Abe, Yoshihide Yanai, Yoshiyuki Yato
BACKGROUND: The sufficiency of screw anchoring is a critical factor for achieving successful spinal fusion; however, no reliable method for predicting pedicle screw fixation has been established. Recently, Hounsfield units (HU) obtained from computed tomography (CT) was developed as a new reliable tool to determine the bone quality. The purpose of the present study was to demonstrate the utility of regional HU measurement of the screw trajectory to predict the primary and long-term fixation strength of pedicle screws...
December 19, 2017: Acta Neurochirurgica
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
#12
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/29237967/evaluation-of-dose-calculation-accuracy-of-various-algorithms-in-lung-equivalent-inhomogeneity-comparison-of-calculated-data-with-gafchromic-film-measured-results
#13
Teerth Raj Verma, Nirmal K Painuly, Surendra P Mishra, Navin Singh, M L B Bhatt, Naseem Jamal, M C Pant
AIM: To evaluate dose calculation accuracy of various algorithms in lung equivalent inhomogeneity comprising tumor within it and comparison with Gafchromic film data. MATERIALS AND METHODS: Gafchromic film measured central axis absorbed dose in lung insert (-700 Hounsfield unit [HU]), in racemosa wood cylindrical inhomogeneity (-725 HU) and at three surfaces of tumor (-20 HU) created in cylindrical inhomogeneity, put in the cavity of computerized imaging reference systems (CIRS) thorax phantom were compared with convolution (CON), superposition (SP), fast SP (FSP), and X-ray voxel Monte Carlo (XVMC) algorithms calculated dose using 6 MV beams of field size 2 cm × 2 cm, 3 cm × 3 cm, 4 cm × 4 cm, 5 cm × 5 cm, and 8 cm × 8 cm...
October 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/29233015/the-benefits-of-folic-acid-modified-gold-nanoparticles-in-ct-based-molecular-imaging-radiation-dose-reduction-and-image-contrast-enhancement
#14
Jaber Beik, Maryam Jafariyan, Alireza Montazerabadi, Ali Ghadimi-Daresajini, Parastoo Tarighi, Alireza Mahmoudabadi, Habib Ghaznavi, Ali Shakeri-Zadeh
X-ray computed tomography (CT) requires an optimal compromise between image quality and patient dose. While high image quality is an important requirement in CT, the radiation dose must be kept minimal to protect the patients from ionizing radiation-associated risks. The use of probes based on gold nanoparticles (AuNPs) along with active targeting ligands for specific recognition of cancer cells may be one of the balanced solutions. Herein, we report the effect of folic acid (FA)-modified AuNP as a targeted nanoprobe on the contrast enhancement of CT images as well as its potential for patient dose reduction...
December 12, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29221318/lung-densitometry-why-how-and-when
#15
REVIEW
Mario Mascalchi, Gianna Camiciottoli, Stefano Diciotti
Lung densitometry assesses with computed tomography (CT) the X-ray attenuation of the pulmonary tissue which reflects both the degree of inflation and the structural lung abnormalities implying decreased attenuation, as in emphysema and cystic diseases, or increased attenuation, as in fibrosis. Five reasons justify replacement with lung densitometry of semi-quantitative visual scales used to measure extent and severity of diffuse lung diseases: (I) improved reproducibility; (II) complete vs. discrete assessment of the lung tissue; (III) shorter computation times; (IV) better correlation with pathology quantification of pulmonary emphysema; (V) better or equal correlation with pulmonary function tests (PFT)...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29218502/lower-preoperative-hounsfield-unit-values-are-associated-with-intra-operative-fractures-in-cementless-bipolar-hemiarthroplasty
#16
Seung-Ju Kim, Hyun-Soo Park, Dong-Woo Lee, Jong Hun Kim
The use of Hounsfield units (HU) from CT scanning to assess regional BMD has been described. Therefore, we evaluated whether HU could be used to identify osteoporosis of the proximal part of the femur. The results showed that HU assessment is associated with the presence of intra-operative fracture during arthroplasty. INTRODUCTION: The aim with this study was to determine the association of preoperative Hounsfield unit (HU) in hip computed tomography (CT) with intra-operative osteoporotic fracture during cementless hemiarthroplasty...
December 7, 2017: Archives of Osteoporosis
https://www.readbyqxmd.com/read/29218387/anatomic-parameters-of-the-sacral-lamina-for-osteosynthesis-in-transverse-sacral-fractures
#17
Yoshihiro Katsuura, Eileen Lorenz, Warren Gardner
PURPOSE: To analyze the morphometric parameters of the dorsal sacral lamina and pedicles to determine if there is adequate bony architecture to support plate osteosynthesis. METHODS: Two reviewers performed measurements on 98 randomly selected high-resolution CT scans of the pelvis to quantify the bony anatomy of the sacral lamina. Measurements included the depths of the lamina at each sacral level, the trajectory and depth of the sacral pedicles from the sacral lamina, and the width of the sacral canal...
December 8, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29214485/two-phase-contrast-injection-protocol-for-pediatric-cardiac-computed-tomography-in-children-with-congenital-heart-disease
#18
Naoki Fukuyama, Akira Kurata, Naoto Kawaguchi, Ryo Tashiro, Takashi Higaki, Takahiro Yokoi, Yuki Tanabe, Hikaru Nishiyama, Toshihide Itoh, Teruhito Kido, Masao Miyagawa, Teruhito Mochizuki
To assess a two-phase contrast injection protocol for contrast enhancement during cardiac computed tomography (CT) in children with congenital heart disease. Forty-three children (20 boys, 23 girls) of median age 13 months (range 3 days-8.3 years) and weighing ≤ 20 kg who underwent cardiac CT using a two-phase contrast injection protocol at our institution were retrospectively identified. High-pitch spiral third-generation dual-source cardiac CT (tube voltage 70 kV) was performed with a fixed delay of 60 s after contrast injection in the order of 10 mgI/kg/s (30 s), 15 mgI/kg/s (20 s), and a saline chaser (10 s)...
December 6, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29208759/the-role-of-multidetector-computed-tomography-and-the-forced-oscillation-technique-in-assessing-lung-damage-in-adults-with-cystic-fibrosis
#19
Letícia S Lacerda, Agnaldo J Lopes, Alysson R S Carvalho, Alan R M Guimarães, Mônica C Firmida, Marcos C S Castro, Roberto Mogami, Pedro L Melo
BACKGROUND: With increased survival rates and the consequent emergence of an adult population with cystic fibrosis (CF), developing novel tools for periodic evaluations of these patients has become a new challenge. Thus, we sought to determine the contribution of lung-volume quantification using multidetector computed tomography (CT) in adults with CF and to investigate the association between structural changes and functional abnormalities. METHODS: This was a cross-sectional study in which 21 adults with CF and 22 control subjects underwent lung-volume quantification using multidetector CT...
December 5, 2017: Respiratory Care
https://www.readbyqxmd.com/read/29197913/an-alternative-finger-in-robotic-assisted-thoracic-surgery-intraoperative-ultrasound-localization-of-pulmonary-nodules
#20
Zhenyu Zhou, Zhitian Wang, Zhelan Zheng, Jinlin Cao, Chong Zhang, Zhehao He, Wang Lv, Jian Hu
AIM: Robotic-assisted thoracic surgery (RATS) has become a promising treatment for pulmonary neoplasms. During RATS, intraoperative ultrasonography can act as an "alternative finger" to "touch" and locate lesions, especially pulmonary nodules. This study was aimed to investigate the efficacy of intraoperative ultrasonographic localization during da Vinci RATS procedures. MATERIAL AND METHODS: Patients with pulmonary nodules were randomly divided into an Experimental Group and Control Group in which nodules were respectively located using intraoperative ultrasonography or by the surgeon's anatomic knowledge...
November 29, 2017: Medical Ultrasonography
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