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CT imaging, increasing accuracy

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https://www.readbyqxmd.com/read/29137676/a-medium-invasiveness-multi-level-patient-s-specific-template-for-pedicle-screw-placement-in-the-scoliosis-surgery
#1
Farhad Azimifar, Kamran Hassani, Amir Hossein Saveh, Farhad Tabatabai Ghomsheh
BACKGROUND: Several methods including free-hand technique, fluoroscopic guidance, image-guided navigation, computer-assisted surgery system, robotic platform and patient's specific templates are being used for pedicle screw placement. These methods have screw misplacements and are not always easy to be applied. Furthermore, it is necessary to expose completely a large portions of the spine in order to access fit entirely around the vertebrae. METHODS: In this study, a multi-level patient's specific template with medium invasiveness was proposed for pedicle screw placement in the scoliosis surgery...
November 14, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29130586/prognostic-implication-of-fluorine-18-fluorodeoxyglucose-positron-emission-tomography-computed-tomography-in-patients-with-recurrent-papillary-thyroid-cancer
#2
Ji-Hun Kang, Da-Woon Jung, Kyoung-June Pak, In-Ju Kim, Hak-Jin Kim, Jae-Keun Cho, Sung-Chan Shin, Soo-Geun Wang, Byung-Joo Lee
BACKGROUND: Fluorine-18 fluorodeoxyglucose positron emission tomography/CT ((18) F-FDG PET/CT) has been widely accepted as an effective method for detecting recurrent papillary thyroid cancer (PTC) in patients with increased serum thyroglobulin (Tg) or Tg antibody (TgAb) levels and negative whole-body scintigraphy (WBS) results. The role of WBS as a diagnostic tool in detecting recurrence has relatively decreased recently. However, only a few studies have examined the usefulness of (18) F-FDG PET/CT for evaluating patients with recurrent PTC, regardless of the WBS results...
November 11, 2017: Head & Neck
https://www.readbyqxmd.com/read/29123012/prostate-cancer-molecular-imaging-standardized-evaluation-promise-proposed-mitnm-classification-for-the-interpretation-of-psma-ligand-pet-ct
#3
Matthias Eiber, Ken Herrmann, Jeremie Calais, Boris Hadaschihk, Frederik L Giesel, Markus Hartenbach, Thomas Hope, Robert Reiter, Tobias Maurer, Wolfgang A Weber, Wolfgang P Fendler
Prostate-specific membrane antigen (PSMA)-ligand positron emission tomography (PET)-imaging provides unprecedented accuracy for whole body staging of prostate cancer. As PSMA-ligand PET/computed tomography (CT) is increasingly adopted in clinical trials and routine practice worldwide, a unified language for image reporting is urgently needed. We propose a molecular imaging tumor, node and metastasis system (miTNM Version 1.0) as standardized reporting framework for PSMA-ligand PET/CT or PET/magnetic resonance imaging (MRI)...
November 9, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29122361/ventilation-measured-on-clinical-4d-cbct-increased-ventilation-accuracy-through-improved-image-quality
#4
Kasper R Jensen, Carsten Brink, Olfred Hansen, Uffe Bernchou
BACKGROUND AND PURPOSE: Ventilation measured on 4D cone-beam computed tomography (CBCT) using deformable image registration (DIR) may predict specific radiation sensitivity, but the measurement is affected by the current image quality. With 4D computed tomography (CT) measured ventilation acting as a gold standard the current study investigates if image improvements increase the accuracy of 4D-CBCT measured ventilation. MATERIAL AND METHODS: The study consists of 4D-CBCT and 4D-CT scans of 20 non-small-cell lung cancer patients...
November 6, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29119677/minimal-mask-immobilization-with-optical-surface-guidance-for-head-and-neck-radiotherapy
#5
Bo Zhao, Genevieve Maquilan, Steve Jiang, David L Schwartz
PURPOSE: Full face and neck thermoplastic masks provide standard-of-care immobilization for patients receiving H&N IMRT. However, these masks are uncomfortable and increase skin dose. The purpose of this pilot trial was to investigate the feasibility and setup accuracy of minimal face and neck mask immobilization with optical surface guidance. METHODS: Twenty patients enrolled onto this IRB-approved protocol. Patients were immobilized with masks securing only forehead and chin...
November 9, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29117314/assessment-of-fluorodeoxyglucose-f18-labeled-positron-emission-tomography-for-diagnosis-of-high-risk-lung-nodules
#6
Amelia W Maiga, Stephen A Deppen, Sarah Fletcher Mercaldo, Jeffrey D Blume, Chandler Montgomery, Laszlo T Vaszar, Christina Williamson, James M Isbell, Otis B Rickman, Rhonda Pinkerman, Eric S Lambright, Jonathan C Nesbitt, Eric L Grogan
Importance: Clinicians rely heavily on fluorodeoxyglucose F18-labeled positron emission tomography (FDG-PET) imaging to evaluate lung nodules suspicious for cancer. We evaluated the performance of FDG-PET for the diagnosis of malignancy in differing populations with varying cancer prevalence. Objective: To determine the performance of FDG-PET/computed tomography (CT) in diagnosing lung malignancy across different populations with varying cancer prevalence. Design, Setting, and Participants: Multicenter retrospective cohort study at 6 academic medical centers and 1 Veterans Affairs facility that comprised a total of 1188 patients with known or suspected lung cancer from 7 different cohorts from 2005 to 2015...
November 8, 2017: JAMA Surgery
https://www.readbyqxmd.com/read/29110185/positioning-error-of-custom-3d-printed-surgical-guides-for-the-radius-influence-of-fitting-location-and-guide-design
#7
G Caiti, J G G Dobbe, G J Strijkers, S D Strackee, G J Streekstra
PURPOSE: Utilization of 3D-printed patient-specific surgical guides is a promising navigation approach for orthopedic surgery. However, navigation errors can arise if the guide is not correctly positioned at the planned bone location, compromising the surgical outcome. Quantitative measurements of guide positioning errors are rarely reported and have never been related to guide design and underlying bone anatomy. In this study, the positioning accuracy of a standard and an extended guide design with lateral extension is evaluated at different fitting locations (distal, mid-shaft and proximal) on the volar side of the radius...
November 6, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29104741/lymph-node-imaging-in-initial-staging-of-prostate-cancer-an-overview-and-update
#8
REVIEW
Jessica G Zarzour, Sam Galgano, Jonathan McConathy, John V Thomas, Soroush Rais-Bahrami
Accurate nodal staging at the time of diagnosis of prostate cancer is crucial in determining a treatment plan for the patient. Pelvic lymph node dissection is the most reliable method, but is less than perfect and has increased morbidity. Cross sectional imaging with computed tomography (CT) and magnetic resonance imaging (MRI) are non-invasive tools that rely on morphologic characteristics such as shape and size of the lymph nodes. However, lymph nodes harboring metastatic disease may be normal sized and non-metastatic lymph nodes may be enlarged due to reactive hyperplasia...
October 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/29100255/multidetector-computed-tomography-angiography-md-cta-of-coronary-artery-bypass-grafts-update-2017
#9
Florian Jungmann, Tilman Emrich, Peter Mildenberger, Anna Lena Emrich, Christoph Düber, K F Kreitner
Background Coronary artery bypass grafting (CABG) is still an important therapeutic approach in the treatment especially of advanced coronary artery disease. In this study, we elucidate the current role of multidetector computed tomography angiography (MD-CTA) in imaging patients after CABG surgery. Method This study is based on recent reports in the literature (2007 - 2016) on imaging of CABG using 64-slice MD-CT scanners and beyond. We included 13 reports that compared ECG-gated MD-CTA with conventional invasive coronary angiography (ICA) as the reference standard for the assessment of graft patency and for the detection of > 50 % stenoses...
November 3, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/29098601/optimization-of-a-shorter-variable-acquisition-time-for-legs-to-achieve-true-whole-body-pet-ct-images
#10
Takuro Umeda, Kenta Miwa, Taisuke Murata, Noriaki Miyaji, Kei Wagatsuma, Kazuki Motegi, Takashi Terauchi, Mitsuru Koizumi
The present study aimed to qualitatively and quantitatively evaluate PET images as a function of acquisition time for various leg sizes, and to optimize a shorter variable-acquisition time protocol for legs to achieve better qualitative and quantitative accuracy of true whole-body PET/CT images. The diameters of legs to be modeled as phantoms were defined based on data derived from 53 patients. This study analyzed PET images of a NEMA phantom and three plastic bottle phantoms (diameter, 5.68, 8.54 and 10.7 cm) that simulated the human body and legs, respectively...
November 2, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29097409/optimizing-image-quantification-for-lu-177-spect-ct-based-on-a-3d-printed-2-compartment-kidney-phantom
#11
Johannes Tran-Gia, Michael Lassmann
The aim of this work was to find an optimal setup for activity determination of Lu-177-based single photon emission computed tomography (SPECT) / computed tomography (CT) imaging reconstructed with two commercially available reconstructions (xSPECT Quant and Flash3D, Siemens Healthcare). For this purpose, 3D printed phantoms of different geometries were manufactured, different partial volume correction (PVC) methods were applied, and the accuracy of the activity determination was evaluated. METHODS: A 2-compartment kidney phantom (70% cortical and 30% medullary compartment), a sphere, and an ellipsoid of equal volumes were 3D printed, filled with Lu-177, and scanned with a SPECT/CT system...
November 2, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29090220/3d-liver-tumor-segmentation-in-ct-images-using-improved-fuzzy-c-means-and-graph-cuts
#12
Weiwei Wu, Shuicai Wu, Zhuhuang Zhou, Rui Zhang, Yanhua Zhang
Three-dimensional (3D) liver tumor segmentation from Computed Tomography (CT) images is a prerequisite for computer-aided diagnosis, treatment planning, and monitoring of liver cancer. Despite many years of research, 3D liver tumor segmentation remains a challenging task. In this paper, an efficient semiautomatic method was proposed for liver tumor segmentation in CT volumes based on improved fuzzy C-means (FCM) and graph cuts. With a single seed point, the tumor volume of interest (VOI) was extracted using confidence connected region growing algorithm to reduce computational cost...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29078584/anatomical-video-assisted-thoracoscopic-surgery-segmentectomies-based-on-the-three-dimensional-reformation-images
#13
Qianli Ma, Tong Bao, Haitao Zhang, Chaoyang Liang, Deruo Liu
Segmentectomy was first done in 1939 by Churchill and Belsey in 1939. Video-assisted thoracoscopic surgery (VATS) segmentectomies are still more technically challenging than VATS lobectomies. With the increasing rate of early stage lung carcinomas, the thoracoscopic segmentectomies may have a major role in a near future. Four anatomical VATS segmentectomy videos clips were shared in this study. CT three-dimensional reformation could exactly show the small pulmonary nodule's precise position, clarifies the surrounding structures' relationship like the pulmonary artery (PA), pulmonary vein (PV), bronchus (B), fissure, and lymph nodes...
2017: J Vis Surg
https://www.readbyqxmd.com/read/29076457/investigating-the-generalisation-of-an-atlas-based-synthetic-ct-algorithm-to-another-centre-and-mr-scanner-for-prostate-mr-only-radiotherapy
#14
Jonathan Wyatt, Jason A Dowling, Charles G Kelly, Jill McKenna, Emily Johnstone, Richard Speight, Ann Henry, Peter B Greer, Hazel Mhairi McCallum
There is increasing interest in MR-only radiotherapy planning since it provides superb soft-tissue contrast without the registration uncertainties inherent in a CT-MR registration. However MR images cannot readily provide the electron density information necessary for radiotherapy dose calculation. An algorithm which generates synthetic CT's for dose calculations from MR images of the prostate using an atlas of 3 T MR images has been previously reported by two of the authors. This paper aimed to evaluate this algorithm using MR data acquired at a different field strength and a different centre to the algorithm atlas...
October 27, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29072320/technical-note-correction-for-the-effect-of-breathing-variations-in-ct-pulmonary-ventilation-imaging
#15
Tokihiro Yamamoto, Sven Kabus
PURPOSE: The accuracy and precision of computed tomography (CT) pulmonary ventilation imaging with conventional CT scanners are limited by breathing variations. We propose a method to correct for the effect of breathing variations in CT ventilation imaging based on external respiratory signals acquired throughout a scan. METHODS: The proposed method is based on: (1) calculating voxel-by-voxel abdominal surface motion ranges using four-dimensional (4D) CT image datasets spatiotemporally correlated with external respiratory monitor data, and (2) applying the correction factor, which is defined as the ratio of the overall mean of the abdominal surface motion range in the lungs to that of each voxel, to the CT ventilation value...
October 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/29071430/functional-information-in-coronary-artery-disease-the-case-of-computed-tomography-myocardial-perfusion
#16
REVIEW
Klaus F Kofoed, Mathias H Sørgaard, Jesper J Linde
PURPOSE OF REVIEW: To review methodological and logistical aspects of CT myocardial perfusion, current clinical evidence and possible future directions, with specific focus on use in patients with coronary artery disease (CAD). RECENT FINDINGS: CT myocardial perfusion imaging may be performed as an add-on to standard coronary CT angiography (CCTA), to identify regions of myocardial hypoperfusion, at rest and during adenosine stress. The principle of measurement is well-validated in animal experimental models, and CT myocardial perfusion imaging has a high degree of concordance with already clinically available perfusion imaging methods...
October 25, 2017: Current Cardiology Reports
https://www.readbyqxmd.com/read/29069013/incidentally-polycystic-kidney-disease-identified-by-spect-ct-with-post-therapy-radioiodine-scintigraphy-in-a-patient-with-differentiated-thyroid-carcinoma-a-case-report
#17
Yan-Xia Mi, Xin Sui, Jian-Min Huang, Ling-Ge Wei, Peng Xie
RATIONALE: Post-therapy or diagnostic whole-body radioiodine scintigraphy is widely employed to evaluate the residual, recurrence, or metastases of differentiated thyroid carcinoma because of the high sensitivity and accuracy. However, it has pitfalls. PATIENT CONCERNS: We described a 63-year-old male with a history of papillary thyroid carcinoma who was referred for iodine-131 ablation therapy. The post-therapy iodine-131 whole-body images demonstrated abnormal increased uptake of the tracer in the regions of bilateral upper abdomen...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29064752/improving-clinical-information-on-head-ct-requisitions-from-the-emergency-department-to-aid-interpretation-and-billing-efficiency
#18
Dillon Barron, Thomas Spiegel, Gregory L Katzman, Kateland Haas, Saad Ali
OBJECTIVE: The accuracy of radiologic interpretations is higher when appropriate clinical information is provided, as is the likelihood of reimbursement for the studies. The purpose of this project was to evaluate and improve the quality of clinical information provided on head CT requisitions from an urban emergency department (ED). SUBJECTS AND METHODS: In a prospective study conducted from July 2015 to May 2016, attending neuroradiologists evaluated 1100 randomly selected ED requisitions for unenhanced head CT, grading them for clinical and billing adequacy on a scale of 0-2...
October 24, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29063257/detection-of-lung-carcinoma-with-predominant-ground-glass-opacity-on-ct-using-temporal-subtraction-method
#19
Takashi Terasawa, Takatoshi Aoki, Seiichi Murakami, Hyoungseop Kim, Masami Fujii, Michiko Kobayashi, Chihiro Chihara, Yoshiko Hayashida, Yukunori Korogi
PURPOSE: To evaluate the usefulness of the CT temporal subtraction (TS) method for the detection of the lung cancer with predominant ground-glass opacity (LC-pGGO). MATERIALS AND METHODS: Twenty-five pairs of CT and their TS images in patients with LC-pGGO (31 lesions) and 25 pairs of those in patients without nodules were used for an observer performance study. Eight radiologists participated and the statistical significance of differences with and without the CT-TS was assessed by JAFROC analysis...
October 23, 2017: European Radiology
https://www.readbyqxmd.com/read/29042168/autonomous-bone-reposition-around-anatomical-landmark-for-robot-assisted-orthognathic-surgery
#20
Sang-Yoon Woo, Sang-Jeong Lee, Ji-Yong Yoo, Jung-Joon Han, Soon-Jung Hwang, Kyung-Hoe Huh, Sam-Sun Lee, Min-Suk Heo, Soon-Chul Choi, Won-Jin Yi
The purpose of this study was to develop a new method for enabling a robot to assist a surgeon in repositioning a bone segment to accurately transfer a preoperative virtual plan into the intraoperative phase in orthognathic surgery. We developed a robot system consisting of an arm with six degrees of freedom, a robot motion-controller, and a PC. An end-effector at the end of the robot arm transferred the movements of the robot arm to the patient's jawbone. The registration between the robot and CT image spaces was performed completely preoperatively, and the intraoperative registration could be finished using only position changes of the tracking tools at the robot end-effector and the patient's splint...
September 19, 2017: Journal of Cranio-maxillo-facial Surgery
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