keyword
MENU ▼
Read by QxMD icon Read
search

gamma camera

keyword
https://www.readbyqxmd.com/read/29151546/-a-comparison-of-planar-sensitivity-and-spatial-resolution-among-different-collimators-and-energy-windows-on-223-ra-imaging
#1
Takuro Umeda, Noriaki Miyaji, Shuto Nakazawa, Kenta Miwa, Kei Wagatsuma, Kazuki Motegi, Tomohiro Takiguchi, Mitsuru Koizumi
OBJECTIVE: The present study aimed to reveal the influence of combination of different collimators and energy windows on the planar sensitivity and the spatial resolution during experimental (223)Ra imaging, and to determine optimal imaging parameters. METHODS: A vial type source containing (223)Ra solution (4.55 MBq / 5.6 ml) was placed in the air at 100 mm away from the collimator surface. Planar images were acquired with LEHR, LMEGP, ELEGP and MEGP collimators on two dual-head gamma cameras (Symbia intevo (Siemens) and Infinia 3 (GE))...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29142346/conjugation-of-antibodies-with-radiogold-nanoparticles-as-an-effector-targeting-agents-in-radiobioconjugate-cancer-therapy-optimized-labeling-and-biodistribution-results
#2
Pankaj Garg, Daya Kishore Hazra
Purpose of the Study: Drug accessibility to the tumor cells is an important area of concern with an anticipation of increasing the efficacy of the drug to be delivered to a specific site. The biogenesis of gold nanoparticles using plant-mediated phytochemical extracts and their possible linkage to cancer antibodies with an aim at delivering the conjugate specifically to the tumor-associated antigen is the basic objective of the research. Materials and Methodology: Radiolabeling of antibodies with gold nanoparticles was carried out by a protocol, and the labeling extent of antibodies was compared with that of a radiogold solution to ordinary particulate size (AuNO-Ab)...
October 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/29142344/investigating-the-role-of-global-histogram-equalization-technique-for-99m-technetium-methylene-diphosphonate-bone-scan-image-enhancement
#3
Anil Kumar Pandey, Param Dev Sharma, Pankaj Dheer, Girish Kumar Parida, Harish Goyal, Chetan Patel, Chandrashekhar Bal, Rakesh Kumar
Purpose of the Study: (99m)Technetium-methylene diphosphonate ((99m)Tc-MDP) bone scan images have limited number of counts per pixel, and hence, they have inferior image quality compared to X-rays. Theoretically, global histogram equalization (GHE) technique can improve the contrast of a given image though practical benefits of doing so have only limited acceptance. In this study, we have investigated the effect of GHE technique for (99m)Tc-MDP-bone scan images. Materials and Methods: A set of 89 low contrast (99m)Tc-MDP whole-body bone scan images were included in this study...
October 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/29142343/calculating-gamma-camera-uniformity-parameters-beyond-the-vendor-specific-protocol
#4
Anil Kumar Pandey, Param Dev Sharma, Jay Prakash Kumar, Kartik Saroha, Chetan Patel, Chandra Sekhar Bal, Rakesh Kumar
Objectives: The aim of this study was to develop and verify a personal computer-based software tool for calculating uniformity indices of gamma camera. Materials and Methods: The program was developed in MATLAB R2013b under Microsoft Windows operating system. Noise-less digital phantoms with known uniformity parameters were used to verify the accuracy of the program. Two hundred and forty-four Co-57 flood source images were acquired on Symbia T6 and Discovery nuclear medicine/computed tomography 670...
October 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/29127242/gamma-camera-based-method-for-131-i-capsule-counting-an-alternate-method-to-uptake-probe-method
#5
Biju K Menon, Awasare S Uday, Baghel N Singh
The main objective of this study was to check the validity of using gamma camera as an alternate method to thyroid uptake probe, for counting 25uCi (0.925 MBq) and 50uCi (1.85 MBq) (131)I capsules before administration to thyroid patients. Methods: - 10 sets each of 25uCi (0.925 MBq) and 50uCi (1.85 MBq) (131)I capsules received from Board Of Radiation and Isotope Technology, Department Of Atomic Energy, India (BRIT, DAE) have been counted individually using thyroid uptake probe for 10 seconds following institutional protocol and also by keeping individual capsule of a set with 8cm gap between each of them ...
November 10, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/29125780/segmentation-of-whole-body-images-into-two-compartments-in-model-for-bone-marrow-dosimetry-increases-the-correlation-with-hematological-response-in-177-lu-dotatate-treatments
#6
Linn Hagmarker, Johanna Svensson, Tobias Rydén, Peter Gjertsson, Peter Bernhardt
BACKGROUND: In (177)Lu-DOTATATE treatments, bone marrow (BM) is one of the most important organs at risk. The authors previously developed an image-based two-compartment method for BM dosimetry, showing a significant correlation between absorbed dose to BM and hematological toxicity in (177)Lu-DOTATATE treatments. In the present study, they aimed to further evaluate this BM dosimetry method by finding optimal settings for dividing the whole body into two compartments; in terms of minimizing the coefficient of variation (CV) for the individual absorbed doses and studying its correlation to the BM response...
November 2017: Cancer Biotherapy & Radiopharmaceuticals
https://www.readbyqxmd.com/read/29122042/peroxisome-proliferator-activated-receptor-gamma-ppar%C3%AE-agonist-fails-to-overcome-trans-10-cis-12-conjugated-linoleic-acid-cla-inhibition-of-milk-fat-in-dairy-sheep
#7
E C Sandri, M Camêra, E M Sandri, K J Harvatine, D E De Oliveira
The trans-10, cis-12 conjugated linoleic acid (CLA) causes milk fat depression by downregulating expression of genes and transcription factors involved in lipogenesis and it has been proposed that peroxisome proliferator-activated receptor gamma (PPARγ) can be inhibited by trans-10, cis-12 CLA. The PPARγ is a nuclear receptor activated by natural or synthetic ligands and promotes expression of lipogenic genes and its effect on mammary lipogenesis and the interaction with trans-10, cis-12 CLA in lactating ewes was evaluated using thiazolidinedione (TZD), a chemical PPARγ agonist...
November 10, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/29113697/sensitivity-of-a-prompt-gamma-slit-camera-to-detect-range-shifts-for-proton-treatment-verification
#8
Lena Nenoff, Marlen Priegnitz, Guillaume Janssens, Johannes Petzoldt, Patrick Wohlfahrt, Anna Trezza, Julien Smeets, Guntram Pausch, Christian Richter
BACKGROUND AND PURPOSE: A prompt-gamma imaging (PGI) slit-camera was recently applied successfully in clinical proton treatments using pencil beam scanning (PBS) and double scattering (DS). However, its full capability under clinical conditions has still to be systematically evaluated. Here, the performance of the slit-camera is systematically assessed in well-defined error scenarios using realistic treatment deliveries to an anthropomorphic head phantom. MATERIALS AND METHODS: The sensitivity and accuracy to detect introduced global and local range shifts with the slit-camera was investigated in PBS and DS irradiations...
November 4, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29112909/potential-diagnostic-value-of-131-i-mibg-myocardial-scintigraphy-in-discrimination-between-alzheimer-disease-and-dementia-with-lewy-bodies
#9
Mehrshad Abbasi, Nafise Ghalandari, Saeed Farzanefar, Vajiheh Aghamollaii, Mona Ahmadi, Morsaleh Ganji, Mohsen Afarideh, Sogol Loloee, Maryam Naseri, Abbas Tafakhori
OBJECTIVES: Clinical difficulty to discriminate between the Alzheimer disease (AD) and dementia with Lewy bodies (DLB) has led researchers to focus on highly sensitive functional imaging modalities. The aim of the present study was to assess (131)I-MIBG cardiac imaging to distinguish between AD and DLB. PATIENTS AND METHODS: Seventeen patients who were known cases of dementia underwent (131)I-MIBG myocardial scintigraphy to differentiate AD from DLB. Planar and (131)I-MIBG SPECT were obtained 2h after the injection of 1mCi (131)I-MIBG on a dual head gamma camera...
October 25, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29099412/dual-time-point-quantitative-spect-ct-parathyroid-imaging-using-a-single-computed-tomography-feasibility-and-operator-variability
#10
Simin Razavi, Blair Ziebarth, Ran Klein, Wanzhen Zeng
OBJECTIVES: Dual-phase parathyroid scan with Tc-sestamibi is a standardized imaging method for diagnosing parathyroid adenoma and hyperplasia. Conventional planar images using a gamma camera are performed routinely in early and delayed time points, followed by a single SPECT-CT. SPECT-CT on both early and delayed time points, although clinically useful, is not commonly performed to avoid extra radiation exposure from computed tomography (CT). This study explores the feasibility of co-registering early and delayed SPECT-CT from a single CT and evaluates the most effective combination of images for co-registration...
November 2, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/29055100/optical-emission-of-223-radium-in-vitro-and-in-vivo-preclinical-applications
#11
Federico Boschi, Francesco De Sanctis, Antonello E Spinelli
(223) Radium ((223) Ra) is widely used in Nuclear medicine to treat patients with osseous metastatic prostate cancer. In clinical practice (223) Ra cannot be imaged directly, however gamma photons produced by its short-lived daughter nuclides can be captured by conventional gamma cameras. In this work we show that (223) Ra and its short-lived daughter nuclides can be detected with optical imaging techniques. The light emission of (223) Ra was investigated in vitro using different setups in order to clarify the mechanism of light production...
October 20, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/29043555/impact-of-non-specific-normal-databases-on-perfusion-quantification-of-low-dose-myocardial-spect-studies
#12
Camilla Scabbio, Orazio Zoccarato, Simona Malaspina, Giovanni Lucignani, Angelo Del Sole, Michela Lecchi
AIM: To evaluate the impact of non-specific normal databases on the percent summed rest score (SR%) and stress score (SS%) from simulated low-dose SPECT studies by shortening the acquisition time/projection. METHODS: Forty normal-weight and 40 overweight/obese patients underwent myocardial studies with a conventional gamma-camera (BrightView, Philips) using three different acquisition times/projection: 30, 15, and 8 s (100%-counts, 50%-counts, and 25%-counts scan, respectively) and reconstructed using the iterative algorithm with resolution recovery (IRR) Astonish(TM) (Philips)...
October 17, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29042467/variability-in-heart-to-mediastinum-ratio-from-planar-123-i-mibg-images-of-a-thorax-phantom-for-6-common-gamma-camera-models
#13
Rikard Owenius, Michelle Zanette, Patrick Cella
A heart-to-mediastinum (H/M) ratio ≥1.6 on planar Iobenguane (123)I ((123)I-mIBG; AdreView) images identifies heart failure patients at low risk of experiencing an adverse cardiac event. This phase 4 study used standardized phantoms to assess the inter-camera, intra-camera, and inter-head variability in H/M ratio determinations from planar cardiac (123)I-mIBG imaging using commercially-available, dual-head gamma cameras. Methods: A fillable thorax phantom was developed to simulate the typical uptake of (123)I-mIBG...
October 17, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/29041166/exponential-fringe-pattern-projection-approach-to-gamma-independent-phase-computation-without-calibration-for-gamma-nonlinearity-in-3d-optical-metrology
#14
Ali Babaei, Mohammad Saadatseresht, Jonathan Kofman
This paper presents a method that expresses the fringe pattern as an exponential function and a mathematical model for gamma-independent phase computation. The method was compared to: (i) conventional phase measurement without nonlinearity correction, and (ii) conventional gamma correction by pattern pre-distortion based on an input-to-projector camera-output look-up table. The pre-distorted and exponential methods achieved large reduction in error compared to conventional computation with no gamma correction...
October 16, 2017: Optics Express
https://www.readbyqxmd.com/read/29032724/reintroducing-the-sodium-iodide-symporter-to-anaplastic-thyroid-carcinoma
#15
Kathrin A Schmohl, Patrick Dolp, Christina Schug, Kerstin Knoop, Kathrin Klutz, Nathalie Schwenk, Peter Bartenstein, Peter J Nelson, Manfred Ogris, Ernst Wagner, Christine Spitzweg
BACKGROUND: Anaplastic thyroid carcinoma (ATC), the most aggressive form of thyroid cancer, is unresponsive to radioiodine therapy. The current study aimed to extend the diagnostic and therapeutic application of radioiodine beyond the treatment of differentiated thyroid cancer by targeting the functional sodium-iodide symporter (NIS) to ATC. METHODS: The study employed nanoparticle vectors (polyplexes) based on linear polyethylenimine (LPEI), shielded by polyethylene glycol (PEG) and coupled to the synthetic peptide GE11 as an epidermal growth factor receptor (EGFR)-specific ligand in order to target a NIS-expressing plasmid (LPEI-PEG-GE11/NIS) to EGFR overexpressing human thyroid carcinoma cell lines...
November 10, 2017: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/29031085/a-study-on-the-extrinsic-sensitivity-and-counting-efficiency-of-a-gamma-camera-for-a-cylindrical-source-and-a-rectangular-detector
#16
Rukiye Çakır Haliloğlu, Özlem Karadeniz, Hatice Durak
In this work, the extrinsic counting efficiency and extrinsic sensitivity of a cylindrical source and a gamma camera with a rectangular detector were determined using homogeneous Tc-99(m). Scattered radiation effects were evaluated by both analyzing the energy spectrum of (99m)Tc for the scatter fraction and plotting the extrinsic counting efficiency and sensitivity. It is found that the scattered fraction values increased with increasing source thickness. Calculated extrinsic sensitivity shows a gradually decreasing trend with increasing source thickness...
October 4, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29031024/use-of-a-lyso-based-compton-camera-for-prompt-gamma-range-verification-in-proton-therapy
#17
Meei-Ling Jan, Ing-Tsung Hsiao, Hsuan-Ming Huang
PURPOSE: A Compton camera (CC), which measures prompt gammas (PGs) emitted during proton therapy, is a potentially useful imaging device for proton range verification. The aim of this study is to evaluate how well the reconstructed PG images obtained from various two-stage CC configurations reproduce the distal falloff of the PG emission. METHODS: We conducted Monte Carlo simulations to evaluate different two-stage CCs positioned orthogonal to a proton pencil beam irradiating a water phantom...
October 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/29025988/advanced-methods-for-radiolabelling-nanomedicines-for-multi-modality-nuclear-mr-imaging
#18
Jennifer R Lamb, Jason P Holland
The advent of hybrid cameras that combine magnetic resonance imaging with either single-photon emission computed tomography (SPECT/MRI) or positron-emission tomography (PET/MRI) has stimulated growing interest in developing multi-modality imaging probes. Countless options are available for fusing magnetically active species with positron- or gamma-ray emitting radionuclides. The initial problem is one of choice: which chemical systems are a suitable basis for developing hybrid imaging agents? Any attempt to answer this question must also address how the physical, chemical, and biological properties of a unified imaging agent can be tailored to ensure that optimum specificity and contrast is achieved simultaneously for both imaging modalities...
October 12, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29023950/synthesis-and-evaluation-of-tc-99m-and-fluorescence-labeled-elastin-derived-peptide-vapg-for-multimodal-tumor-imaging-in-murine-tumor-model
#19
Myoung Hyoun Kim, Chang Guhn Kim, Seul-Gi Kim, Dae-Weung Kim
We developed a Tc-99m and fluorescence labeled peptide, Tc-99m TAMRA-GHEG-ECG-VAPG to target tumor cells, and evaluated the diagnostic performance as a dual-modality imaging agent for tumor in a murine model. TAMRA-GHEG-ECG-VAPG was synthesized using Fmoc solid-phase peptide synthesis. Radiolabeling of TAMRA-GHEG-ECG-VAPG with Tc-99m was done using ligand exchange via tartrate. Binding affinity and in vitro cellular uptake studies were performed. Gamma camera imaging, biodistribution and ex vivo imaging studies were performed in murine models with SW620 tumors...
October 11, 2017: Journal of Labelled Compounds & Radiopharmaceuticals
https://www.readbyqxmd.com/read/29023595/actinide-bioimaging-in-tissues-comparison-of-emulsion-and-solid-track-autoradiography-techniques-with-the-iqid-camera
#20
COMPARATIVE STUDY
Stephanie Lamart, Brian W Miller, Anne Van der Meeren, Anissa Tazrart, Jaime F Angulo, Nina M Griffiths
This work presents a comparison of three autoradiography techniques for imaging biological samples contaminated with actinides: emulsion-based, plastic-based autoradiography and a quantitative digital technique, the iQID camera, based on the numerical analysis of light from a scintillator screen. In radiation toxicology it has been important to develop means of imaging actinide distribution in tissues as these radionuclides may be heterogeneously distributed within and between tissues after internal contamination...
2017: PloS One
keyword
keyword
115151
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"