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https://www.readbyqxmd.com/read/28645684/detection-and-quantification-of-223-ra-uptake-in-bone-metastases-of-patients-with-castration-resistant-prostate-carcinoma-with-the-aim-of-determining-the-absorbed-dose-in-the-metastases
#1
P Mínguez, A Gómez de Iturriaga, I L Fernández, E Rodeño
PURPOSES: To obtain the necessary acquisition and calibration parameters in order to evaluate the possibility of detecting and quantifying (223)Ra uptake in bone metastases of patients treated for castration resistant prostate carcinoma. Furthermore, in the cases in which the activity can be quantified, to determine the absorbed dose. MATERIAL AND METHODS: Acquisitions from a Petri dish filled with (223)Ra were performed in the gamma camera. Monte Carlo simulations were also performed to study the partial volume effect...
June 20, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28644643/first-demonstration-of-a-scintillating-xenon-bubble-chamber-for-detecting-dark-matter-and-coherent-elastic-neutrino-nucleus-scattering
#2
D Baxter, C J Chen, M Crisler, T Cwiok, C E Dahl, A Grimsted, J Gupta, M Jin, R Puig, D Temples, J Zhang
A 30-g xenon bubble chamber, operated at Northwestern University in June and November 2016, has for the first time observed simultaneous bubble nucleation and scintillation by nuclear recoils in a superheated liquid. This chamber is instrumented with a CCD camera for near-IR bubble imaging, a solar-blind photomultiplier tube to detect 175-nm xenon scintillation light, and a piezoelectric acoustic transducer to detect the ultrasonic emission from a growing bubble. The time of nucleation determined from the acoustic signal is used to correlate specific scintillation pulses with bubble-nucleating events...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28644425/significance-of-parathyroid-scintigraphy-and-correlation-of-findings-with-parathyroid-hormone-values-in-patients-undergoing-hemodialysis
#3
Nermana Ahmetbegović, Nadira Suljagić, Vahidin Katica
Aim To compare finding of thyroid gland scintigraphy with serum concentration of parathyroid hormone in patients undergoing hemodialysis. Methods This retrospective-prospective study included 50 patients undergoing hemodialysis with established hyperparathyroidism who were treated at Cantonal Hospital Zenica in the period 2009 - 2014. Besides anthropological data, concentration of parathyroid hormone in serum of patients was monitored too. Scintigraphy was performed at the Department of Nuclear Medicine using two-headed gamma camera Prism 2000xp...
August 1, 2017: Medicinski Glasnik
https://www.readbyqxmd.com/read/28611231/validation-of-the-left-ventricular-ejection-fraction-with-iq-spect-system-in-small-heart-patients
#4
Hiroto Yoneyama, Takayuki Shibutani, Takahiro Konishi, Asuka Mizutani, Hashimoto Ryosuke, Masahisa Onoguchi, Koichi Okuda, Shinro Matsuo, Kenichi Nakajima, Kinuya Seigo
The IQ-SPECT system equipped with a multifocal (SMARTZOOM) collimator using an ordered subset conjugate gradient minimization (OSCGM) algorithm reduces the acquisition time of myocardial perfusion imaging (MPI) compared to conventional gamma cameras equipped with low-energy high-resolution (LEHR) collimators. We compared IQ-SPECT with a conventional single-photon emission computed tomography (SPECT) system for estimating the left ventricular ejection fraction (LVEF) in small-heart patients. Methods: The study group consisted of 98 consecutive patients who underwent a 1-day stress-rest MPI study with a (99m)Tc-labeled agent for preoperative risk assessment...
June 13, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/28610692/a-didactic-experiment-showing-the-compton-scattering-by-means-of-a-clinical-gamma-camera
#5
Ernesto Amato, Lucrezia Auditore, Alfredo Campennì, Fabio Minutoli, Mariapaola Cucinotta, Alessandro Sindoni, Sergio Baldari
We describe a didactic approach aimed to explain the effect of Compton scattering in nuclear medicine imaging, exploiting the comparison of a didactic experiment with a gamma camera with the outcomes from a Monte Carlo simulation of the same experimental apparatus. We employed a (99m)Tc source emitting 140.5keV photons, collimated in the upper direction through two pinholes, shielded by 6mm of lead. An aluminium cylinder was placed on the source at 50mm of distance. The energy of the scattered photons was measured on the spectra acquired by the gamma camera...
June 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28566259/multimodal-approach-in-radioguided-surgery-in-a-case-of-multiple-paraganglioma
#6
N Sánchez, A Tapias, H Bowles, E Delgado, R Almenara, D Fuster, S Vidal-Sicart
The case involves a 34-year-old who underwent surgical removal of a retroperitoneal paraganglioma adjacent to the left kidney lower pole, and visualized by CT and MRI. The (123)I-MIBG scan was positive for this lesion and, in addition, another more caudal uptake, of smaller size and intensity, was observed at L5 level. It was not considered for removal, due to its lack of morphological definition. One week after the surgery, the patient presented with difficult-to-control high blood pressure. A second (123)I-MIBG scan was performed...
May 26, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28559934/the-current-status-of-spect-or-spect-ct-in-south-korea
#7
REVIEW
Ikdong Yoo, Eun Kyoung Choi, Yong-An Chung
The first step to nuclear medicine in Korea started with introduction of the gamma camera in 1969. Although planar images with the gamma camera give important functional information, they have the limitations that result from 2-dimensional images. Single-photon emission computed tomography (SPECT) due to its 3-dimensional image acquisition is superior to earlier planar gamma imaging in image resolution and diagnostic accuracy. As demand for a hybrid functional and anatomical imaging device has increased, integrated SPECT/CT systems have been used...
June 2017: Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28535414/gamma-radiography-and-tomography-with-a-ccd-camera-and-co-60-source
#8
Robert Adams, Robert Zboray
Gamma imaging using a relatively low strength 5.8mCi laboratory Co-60 source and a CsI(Tl) scintillator screen read out by a CCD camera was investigated. A simple model was used to estimate the effective count rate, which was verified with experiments. Radiography and tomography of phantoms were used to determine the test setup spatial resolution of about 1.3-2.5mm. Exposure times were on the order of a couple minutes per radiograph. These tests demonstrate the value of the count rate model and the feasibility of the setup as a simple and low-cost solution for gamma imaging cases where acquisition time is flexible and resolution requirements are moderate...
May 17, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28522868/first-demonstration-of-multi-color-3-d-in-vivo-imaging-using-ultra-compact-compton-camera
#9
Aya Kishimoto, Jun Kataoka, Takanori Taya, Leo Tagawa, Saku Mochizuki, Shinji Ohsuka, Yuto Nagao, Keisuke Kurita, Mitsutaka Yamaguchi, Naoki Kawachi, Keiko Matsunaga, Hayato Ikeda, Eku Shimosegawa, Jun Hatazawa
In the field of nuclear medicine, single photon emission tomography and positron emission tomography are the two most common techniques in molecular imaging, but the available radioactive tracers have been limited either by energy range or difficulties in production and delivery. Thus, the use of a Compton camera, which features gamma-ray imaging of arbitrary energies from a few hundred keV to more than MeV, is eagerly awaited along with potential new tracers which have never been used in current modalities...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28515582/evaluation-of-mr-perfusion-abnormalities-in-organophosphorus-poisoning-and-its-correlation-with-spect
#10
K Uday Bhanu, Niranjan Khandelwal, Sameer Vyas, Paramjeet Singh, Anuj Prabhakar, B R Mittal, Ashish Bhalla
AIM: Acute organophosphate (OP) pesticide poisoning causes substantial morbidity and mortality worldwide. Many imaging modalities, such as computerized tomography (CT), magnetic resonance imaging (MRI), and single photon emission computed tomography (SPECT) of the brain, have been used for quantitative assessment of the acute brain insult caused by acute OP poisoning. Perfusion defects on SPECT in acutely poisoned patients with OPs have been described, however, MR perfusion abnormalities have not been described in the literature...
January 2017: Indian Journal of Radiology & Imaging
https://www.readbyqxmd.com/read/28461124/pharmacological-ppar%C3%AE-modulation-regulates-sebogenesis-and-inflammation-in-sz95-human-sebocytes
#11
A Mastrofrancesco, M Ottaviani, G Cardinali, E Flori, S Briganti, M Ludovici, C C Zouboulis, V Lora, E Camera, M Picardo
The nuclear receptor peroxisome proliferator-activated receptor gamma (PPARγ) controls the expression of genes involved in the regulation of lipid and glucose metabolism, cell proliferation/differentiation as well as inflammatory pathways. Pivotal studies in human sebocytes and isolated sebaceous glands have raised the interesting possibility that compounds acting on PPARγ can modulate sebaceous lipids and inflammation and, as such, may be useful in the treatment of acne. To investigate the role of this receptor in the regulation of lipid synthesis, proliferation and inflammation, we used the SZ95 sebaceous gland cell line stimulated with insulin...
April 28, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28458734/designing-a-new-molecular-probe-the-potential-role-for-tilmanocept-lymphoseek-%C3%A2-in-the-assessment-of-patients-with-painful-hip-and-knee-joint-prostheses
#12
O O Adesanya, C E Hutchinson
BACKGROUND: There is a long history of nuclear medicine developments in orthopaedics beginning in the early 20(th) century. Technetium-99m ((99m)Tc) has a short half-life of six hours, emits 140 keV gamma rays and is the most widely used isotope, imaged with the Anger (gamma) camera. Gamma image quality and test sensitivity in painful prosthetic joints can be improved with single photon emission computed tomography (SPECT) and SPECT/CT. Positron Emission Tomography-Computed Tomography (PET-CT) with Sodium Fluoride ((18)F-NaF) and (18)Fluorine-fluorodeoxyglucose ((18)F-FDG) PET have promising and limited roles respectively in the investigation of painful prosthetic joints...
2017: Open Orthopaedics Journal
https://www.readbyqxmd.com/read/28458580/lymphoscintigraphy-detecting-alterations-of-upper-limb-lymphatic-flow-following-early-sentinel-lymph-node-biopsy-in-breast-cancer
#13
Almir Jose Sarri, Eduardo Tinois da Silva, Rene Aloisio da Costa Vieira, Katia Hiromoto Koga, Pedro Henrique Moriguchi Cação, Vitor Coca Sarri, Sonia Marta Moriguchi
PURPOSE: To evaluate early variations in lymphatic circulation of the arm pre- and post-sentinel lymph node biopsy (SLNB) and conservative breast surgery by lymphoscintigraphy (LS). PATIENTS AND METHODS: Between 2005 and 2012, 15 patients underwent LS before and after the SLNB (total=30 studies). The pre-SLNB study was considered the control. Early images within twenty minutes (dynamic and static images) and delayed images within ninety minutes of arms and armpits were acquired using a gamma camera...
2017: Breast Cancer: Targets and Therapy
https://www.readbyqxmd.com/read/28457786/gamma-camera-calibrations-for-the-italian-multicentre-study-for-lesion-dosimetry-in-223-ra-therapy-of-bone-metastases
#14
Massimiliano Pacilio, Bartolomeo Cassano, Rosanna Pellegrini, Elisabetta Di Castro, Alessandra Zorz, Giuseppe De Vincentis, Guido Ventroni, Lucio Mango, Stefano Giancola, Mahila Ferrari, Marta Cremonesi, Claudia Bianchi, Giorgio Virotta, Claudia Carbonini, Patrizia Cesana, Cristian Fulcheri, Valentina Reggioli, Alessandra Ricci, Edoardo Trevisiol, Silvia Anglesio, Roberto Pani
PURPOSE: The aim was to calibrate gamma cameras in the framework of the Italian multicentre study for lesion dosimetry in (223)Ra therapy of bone metastases. Equipments of several manufacturers and different models were used. METHODS: Eleven gamma cameras (3/8- and 5/8-inch crystal) were used, acquiring planar static images with double-peak (82 and 154keV, 20% wide) and MEGP collimator. The sensitivity was measured in air, varying source-detector distance and source size...
April 27, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28444638/nuclear-cardiology-are-we-using-the-right-protocols-and-tracers-the-right-way
#15
REVIEW
Maurizio Dondi, Thomas Pascual, Diana Paez, Andrew J Einstein
The field of nuclear cardiology has changed considerably over recent years, with greater attention paid to safety and radiation protection issues. The wider usage of technetium-99m (Tc-99m)-labeled radiopharmaceuticals for single-photon emission computed tomography (SPECT) imaging using gamma cameras has contributed to better quality studies and lower radiation exposure to patients. Increased availability of tracers and scanners for positron emission tomography (PET) will help further improve the quality of studies and quantify myocardial blood flow and myocardial flow reserve, thus enhancing the contribution of non-invasive imaging to the management of coronary artery disease...
April 25, 2017: American Journal of Cardiovascular Drugs: Drugs, Devices, and Other Interventions
https://www.readbyqxmd.com/read/28442945/pulse-train-stimulation-of-primary-somatosensory-cortex-blocks-pain-perception-in-tail-clip-test
#16
Soohyun Lee, Eunjin Hwang, Dongmyeong Lee, Jee Hyun Choi
Human studies of brain stimulation have demonstrated modulatory effects on the perception of pain. However, whether the primary somatosensory cortical activity is associated with antinociceptive responses remains unknown. Therefore, we examined the antinociceptive effects of neuronal activity evoked by optogenetic stimulation of primary somatosensory cortex. Optogenetic transgenic mice were subjected to continuous or pulse-train optogenetic stimulation of the primary somatosensory cortex at frequencies of 15, 30, and 40 Hz, during a tail clip test...
April 2017: Experimental Neurobiology
https://www.readbyqxmd.com/read/28436919/a-machine-learning-method-for-fast-and-accurate-characterization-of-depth-of-interaction-gamma-cameras
#17
Stefano Pedemonte, Larry Pierce, Koen Van Leemput
Measuring the depth-of-interaction (DOI) of gamma photons enables increasing the resolution of emission imaging systems. Several design variants of DOI-sensitive detectors have been recently introduced to improve the performance of scanners for Positron Emission Tomography (PET). However, the accurate characterization of the response of DOI detectors, necessary to accurately measure the DOI, remains an unsolved problem. Numerical simulations are, at the state of the art, imprecise, while measuring directly the characteristics of DOI detectors experimentally is hindered by the impossibility to impose the depth-of-interaction in an experimental set-up...
April 24, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28429391/technical-note-direct-measurement-of-continuous-tmr-data-with-a-1d-tank-and-automated-couch-movements
#18
Nels C Knutson, Matthew C Schmidt, Matthew D Belley, Ngoc B Nguyen, H Harold Li, Erno Sajo, Michael J Price
PURPOSE: Real-time dynamic control of the linear accelerator, couch, and imaging parameters during radiation delivery was investigated as a novel technique for acquiring tissue maximum ratio (TMR) data. METHODS: TrueBeam Developer Mode (Varian Medical Systems, Palo Alto, CA, USA) was used to control the linear accelerator using the Extensible Markup Language (XML). A single XML file was used to dynamically manipulate the machine, couch, and imaging parameters during radiation delivery...
April 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28414454/novel-proximal-sensing-for-monitoring-soil-organic-c-stocks-and-condition
#19
Raphael A Viscarra Rossel, Craig R Lobsey, Chris Sharman, Paul Flick, Gordon McLachlan
Soil information is needed for environmental monitoring to address current concerns over food, water and energy securities, land degradation, and climate change. We developed the Soil Condition ANalysis System (SCANS) to help address these needs. It integrates an automated soil core sensing system (CSS) with statistical analytics and modeling to characterize soil at fine depth resolutions and across landscapes. The CSS's sensors include a γ-ray attenuation densitometer to measure bulk density, digital cameras to image the measured soil, and a visible-near-infrared (vis-NIR) spectrometer to measure iron oxides and clay mineralogy...
May 1, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28408699/a-novel-cerium-141-based-flood-field-uniformity-phantom-assessment-of-its-suitability-to-perform-daily-uniformity-test-in-a-clinical-nuclear-medicine-department
#20
Ashish Kumar Jha, Sneha Mithun, Manoj H Chauhan, Nilendu C Purandare, Sneha Shah, Archi Agrawal, Sanjay Kumar Saxena, Ashutosh Dash, Venkatesh Rangarajan
Daily quality control of a gamma camera is of utmost importance to assess the suitability of the camera for clinical use. Aim of our study is to find out the relevance of indigenously developed (141)Ce -flood field phantom in daily quality control of gamma camera. Material & Method: Uniformity tests were performed by using (141)Ce-flood field phantom and commercially available (57)Co -flood field phantom, and results compared. Result: The average percentage integral uniformity obtained by (141)Ce -flood field phantom and (57)Co -flood field phantom were 3...
April 13, 2017: Journal of Nuclear Medicine Technology
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