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https://www.readbyqxmd.com/read/29536498/volume-perfusion-ratio-from-lung-spect-ct
#1
Wolfgang Michael Schaefer, Daniela Knollmann, Jerome Avondo, Andreas Meyer
AIM: In pulmonary emphysema lung volume reduction procedures (LVRP) can optimize respiratory pump function. Identification of the most affected lobe can be reached using relative lobar volume (relVol) from CT, but this approach disregards the corresponding lobar perfusion. The aim of the study was therefore to establish a new parameter combining relVol from CT and relative perfusion (relPerf) from perfusion SPECT as a single parameter (volume/perfusion ratio (VPR)) to optimize the identification procedure...
February 2018: Nuklearmedizin. Nuclear Medicine
https://www.readbyqxmd.com/read/29536291/feasibility-study-of-a-novel-general-purpose-czt-based-digital-spect-camera-initial-clinical-results
#2
Elinor Goshen, Leonid Beilin, Eli Stern, Tal Kenig, Ronen Goldkorn, Simona Ben-Haim
BACKGROUND: The performance of a prototype novel digital single-photon emission computed tomography (SPECT) camera with multiple pixelated CZT detectors and high sensitivity collimators (Digital SPECT; Valiance X12 prototype, Molecular Dynamics) was evaluated in various clinical settings. Images obtained in the prototype system were compared to images from an analog camera fitted with high-resolution collimators. Clinical feasibility, image quality, and diagnostic performance of the prototype were evaluated in 36 SPECT studies in 35 patients including bone (n = 21), brain (n = 5), lung perfusion (n = 3), and parathyroid (n = 3) and one study each of sentinel node and labeled white blood cells...
March 14, 2018: EJNMMI Physics
https://www.readbyqxmd.com/read/29493500/-the-choice-of-diagnostic-modality-for-acute-pulmonary-embolism
#3
Jonas Munch Nielsen, Jann Mortensen
The diagnosis of pulmonary embolism (PE) relies on clinical assessment, D-dimer test and diagnostic imaging. Modern CT pulmonary angiography (CTPA), ventilation/perfusion  single-photon emission computed tomography (SPECT) and SPECT/CT are rather equal in terms of sensitivity, specificity and inconclusive results for the diagnosis of PE, outper-forming planar lung scintigraphy. Furthermore, SPECT/CT and CTPA can both provide important information regarding differential diagnoses. Thus, the choice of primary diag-nostic modality relies on local expertise, availability and special circumstances like radiation dose, contraindications and the clinical urgency...
February 19, 2018: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/29423383/biodistribution-of-99mtc-maa-on-spect-ct-performed-for-90y-radioembolization-therapy-planning-a-pictorial-review
#4
J J Bailey, Y Dewaraja, D Hubers, R Srinivasa, K A Frey
Purpose: To evaluate the frequency of 99mTc-MAA uptake in extrahepatic organs during 90Y radioembolization therapy planning. Methods: This retrospective case series of 70 subjects who underwent 99mTc-MAA hepatic artery perfusion studies between January 2014 and July 2016 for 90Y radioembolization therapy planning at our institution involved direct image review for all subjects, with endpoints recorded: lung shunt fraction, extrahepatic radiotracer uptake, time from MAA injection to imaging...
October 2017: Clinical and Translational Imaging: Reviews in Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29409314/data-driven-respiratory-gating-for-ventilation-perfusion-lung-scan
#5
David Morland, Sofiane Guendouzen, Edmond Rust, Dimitri Papathanassiou, Nicolas Passat, Fabrice Hubelé
BACKGROUND: Ventilation/perfusion lung scan is subject to blur due to respiratory motion whether with planar acquisition or single photon emission computed tomography (SPECT). We propose a data- driven gating method for extracting different respiratory phases from lung scan list-mode or dynamic data. METHODS: The algorithm derives a surrogate respiratory signal from an automatically detected diaphragmatic region of interest. The time activity curve generated is then filtered using a Savitzky- Golay filter...
February 5, 2018: Quarterly Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29395208/impact-of-induction-chemoradiotherapy-on-pulmonary-function-after-lobectomy-for-lung-cancer
#6
Hiroaki Nomori, Atsushi Shiraishi, Yue Cong, Kazufusa Shoji, Masafumi Misawa, Hiroshi Sugimura, Yu Oyama
OBJECTIVE: Our study aim was to determine whether there are differential changes in whole-lung and regional lung functions after lobectomy for lung cancer between propensity score-matched patients treated with and without induction chemoradiotherapy, by using single-photon emission computed tomography lung perfusion. METHODS: This study was a retrospective matched cohort study of consecutively acquired data. Pulmonary function test and perfusion scintigraphy were conducted before lobectomy and 6 months after lobectomy in patients treated with induction therapy (n = 72) and in those not treated (n = 170), for measuring functional changes of whole lung, contralateral lung, and lobes...
December 26, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29344922/impact-of-renin-angiotensin-aldosterone-system-polymorphisms-on-myocardial-perfusion-correlations-with-myocardial-single-photon-emission-computed-tomography-derived-parameters
#7
George Angelidis, Maria Samara, Maria Papathanassiou, Maria Satra, Varvara Valotassiou, Ioannis Tsougos, Dimitrios Psimadas, Chara Tzavara, Sotiria Alexiou, John Koutsikos, Nikolaos Demakopoulos, Gregory Giamouzis, Filippos Triposkiadis, John Skoularigis, Panagoula Kollia, Panagiotis Georgoulias
BACKGROUND: Renin-angiotensin-aldosterone system (RAAS) has an important role in atherosclerosis. We investigated the effects of six RAAS gene polymorphisms on myocardial perfusion. METHODS AND RESULTS: We examined 810 patients with known or suspected coronary artery disease (CAD) using stress-rest myocardial single-photon emission computed tomography. Summed stress score (SSS), summed rest score (SRS), summed difference score (SDS), transient ischemic dilation (TID), and lung/heart ratio (LHR) were recorded...
January 17, 2018: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29297607/signal-enhancement-ratio-imaging-of-the-lung-parenchyma-with-ultra-fast-steady-state-free-precession-mri-at-1-5t
#8
Orso Pusterla, Gregor Sommer, Francesco Santini, Mark Wiese, Didier Lardinois, Michael Tamm, Jens Bremerich, Grzegorz Bauman, Oliver Bieri
BACKGROUND: Lung perfusion MRI after i.v. gadolinium (Gd) contrast administration is commonly based on spoiled gradient-echo acquisitions, such as volume-interpolated breath-hold examinations (VIBE), suffering from low signal-to-noise in the parenchyma. PURPOSE: To investigate the lung signal enhancement ratio (SER) with ultra-fast steady-state free precession (ufSSFP) after Gd-administration. STUDY TYPE: Retrospective. SUBJECTS: Ten subjects with healthy lungs; nine patients with pulmonary diseases (chronic obstructive pulmonary disease [COPD], lung cancer, pulmonary fibrosis, lung contusion)...
January 3, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29236220/automatic-lung-segmentation-in-functional-spect-images-using-active-shape-models-trained-on-reference-lung-shapes-from-ct
#9
Grigorios-Aris Cheimariotis, Mariam Al-Mashat, Kostas Haris, Anthony H Aletras, Jonas Jögi, Marika Bajc, Nicolaos Maglaveras, Einar Heiberg
OBJECTIVE: Image segmentation is an essential step in quantifying the extent of reduced or absent lung function. The aim of this study is to develop and validate a new tool for automatic segmentation of lungs in ventilation and perfusion SPECT images and compare automatic and manual SPECT lung segmentations with reference computed tomography (CT) volumes. METHODS: A total of 77 subjects (69 patients with obstructive lung disease, and 8 subjects without apparent perfusion of ventilation loss) performed low-dose CT followed by ventilation/perfusion (V/P) SPECT examination in a hybrid gamma camera system...
February 2018: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/29203289/time-and-dose-related-changes-in-lung-perfusion-after-definitive-radiotherapy-for-nsclc
#10
Katherina P Farr, Azza A Khalil, Ditte S Møller, Henrik Bluhme, Stine Kramer, Anni Morsing, Cai Grau
BACKGROUND AND PURPOSE: To examine radiation-induced changes in regional lung perfusion per dose level in 58 non-small-cell lung cancer (NSCLC) patients treated with intensity-modulated radiotherapy (IMRT). MATERIAL AND METHODS: NSCLC patients receiving chemo-radiotherapy (RT) of minimum 60 Gy were included prospectively in the study. Lung perfusion single-photon emission computed tomography (SPECT/CT) was performed before and serially after RT. Changes (relative to baseline, %) in regional lung perfusion were correlated with regional dose...
December 1, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29161579/correlation-between-lung-perfusion-blood-volume-and-spect-images-in-patients-with-chronic-thromboembolic-pulmonary-hypertension-by-balloon-pulmonary-angioplasty
#11
Hirofumi Koike, Eijun Sueyoshi, Ichiro Sakamoto, Masataka Uetani, Tomoo Nakata, Kouji Maemura
OBJECTIVES: We evaluated the reperfusion by balloon pulmonary angioplasty (BPA) in lung PBV and SPECT images. METHODS: In total, 17 patients and 57 sessions were evaluated. Pre-BPA and post-BPA lung PBV and SPECT/CT images, based on both anatomical segments and physiologic regions (upper/middle/lower) were compared. RESULTS: BPA had a positive effect on most hypoperfused/unperfused segments/regions. There was generally a high rate of agreement between PBV measurements and SPECT/CT...
November 11, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/29154894/non-contrast-quantitative-pulmonary-perfusion-using-flow-alternating-inversion-recovery-at-3t-a-preliminary-study
#12
Joshua S Greer, Christopher D Maroules, Orhan K Oz, Suhny Abbara, Ronald M Peshock, Ivan Pedrosa, Ananth J Madhuranthakam
PURPOSE: To demonstrate the initial feasibility of non-contrast quantitative pulmonary perfusion imaging at 3T using flow alternating inversion recovery (FAIR), and to evaluate the intra-session and inter-session reliability of FAIR measurements at 3T. MATERIALS AND METHODS: Nine healthy volunteers were imaged using our own implementation of FAIR pulse sequence at 3T. Quantitative FAIR perfusion, both with and without larger pulmonary vessels, was correlated with global phase contrast (PC) measured blood flow in the right pulmonary artery (RPA)...
February 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29048464/differences-in-postoperative-changes-in-pulmonary-functions-following-segmentectomy-compared-with-lobectomy
#13
Hiroaki Nomori, Atsushi Shiraishi, Yue Cong, Hiroshi Sugimura, Shuji Mishima
OBJECTIVES: To clarify differences in postoperative changes in systemic and regional pulmonary functions between segmentectomy and lobectomy in patients with lung cancer, we compared the 2 procedures using lung perfusion scintigraphy with a fusion image of single-photon emission computed tomography and computed tomography. METHODS: This study is a retrospective matched cohort study of consecutively acquired data. Pulmonary function tests and perfusion single-photon emission computed tomography/computed tomography were conducted before surgery and 6 months after surgery to measure changes in forced expiratory volume in 1 s of a whole lung, contralateral lung and a lobe...
October 18, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28976338/false-positive-perfusion-ventilation-spect-study-for-pulmonary-embolism-in-a-patient-with-fontan-circulation
#14
Emmanouil Panagiotidis
Fontan circulation is the consequence of an operation that results in the flow of systemic venous blood to the lungs without passing through a ventricle. An 18-year old man with a history of congenital heart disease surgically treated with Fontan circulation, presented with pleuritic chest pain and a raised D-dimer level. Perfusion/ventilation SPECT was performed to exclude the possibility of pulmonary embolism (PE) that showed unilateral reduced perfusion of the left lung with a mismatched right upper lobe defect, suspicious of PE...
October 3, 2017: Molecular Imaging and Radionuclide Therapy
https://www.readbyqxmd.com/read/28942885/mosaic-attenuation-pattern-in-non-contrast-computed-tomography-for-the-assessment-of-pulmonary-perfusion-in-chronic-thromboembolic-pulmonary-hypertension
#15
Hajime Kasai, Nobuhiro Tanabe, Kazushi Fujimoto, Hiromasa Hoshi, Jun Naito, Ryuto Suzuki, Akane Matsumura, Toshihiko Sugiura, Seiichiro Sakao, Koichiro Tatsumi
BACKGROUND: Chronic thromboembolic pulmonary hypertension (CTEPH) is difficult to diagnose as patients rarely present with specific symptoms. However, a mosaic attenuation pattern (MAP) in chest computed tomography (CT) suggests CTEPH. Areas of increased attenuation are not always visible using default CT settings for the lung. Thus, we examined the utility of non-contrast CT imaging with new settings focusing on MAP (CTMosaic ) for the assessment of pulmonary perfusion in patients with CTEPH...
September 2017: Respiratory Investigation
https://www.readbyqxmd.com/read/28936780/ct-based-spect-attenuation-correction-and-assessment-of-infarct-size-results-from-a-cardiac-phantom-study
#16
Alexander Stephan Kroiss, Stephan Gerhard Nekolla, Georg Dobrozemsky, Thomas Grubinger, Barry Lynn Shulkin, Markus Schwaiger
RATIONALE: Myocardial perfusion SPECT is a commonly performed, well established, clinically useful procedure for the management of patients with coronary artery disease. However, the attenuation of photons from myocardium impacts the quantification of infarct sizes. CT-Attenuation Correction (AC) potentially resolves this problem. This contention was investigated by analyzing various parameters for infarct size delineation in a cardiac phantom model. METHODS: A thorax phantom with a left ventricle (LV), fillable defects, lungs, spine and liver was used...
December 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28869670/pulmonary-embolism-in-pregnant-patients-assessing-organ-dose-to-pregnant-phantom-and-its-fetus-during-lung-imaging
#17
Laleh Rafat Motavalli, Elie Hoseinian Azghadi, Hashem Miri Hakimabad, Parisa Akhlaghi
PURPOSE: The purpose of this study was to provide updated radiation dose from diagnostic exams performed for pregnant patients suspected of pulmonary embolism (PE) using the recently developed BREP phantoms of pregnant woman and the fetus. Also to challenge the validity of current recommendations suggest that ventilation/perfusion (V/Q) single photon emission computed tomography (SPECT) vs. computed tomography pulmonary angiography (CTPA) should be considered for diagnosis of PE in radiosensitive groups such as pregnant women...
September 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28740898/priority-driven-plan-optimization-in-locally-advanced-lung-patients-based-on-perfusion-spect-imaging
#18
Martha M Matuszak, Charles Matrosic, David Jarema, Daniel L McShan, Matthew H Stenmark, Dawn Owen, Shruti Jolly, Feng-Ming Spring Kong, Randall K Ten Haken
PURPOSE: Limits on mean lung dose (MLD) allow for individualization of radiation doses at safe levels for patients with lung tumors. However, MLD does not account for individual differences in the extent or spatial distribution of pulmonary dysfunction among patients, which leads to toxicity variability at the same MLD. We investigated dose rearrangement to minimize the radiation dose to the functional lung as assessed by perfusion single photon emission computed tomography (SPECT) and maximize the target coverage to maintain conventional normal tissue limits...
October 2016: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/28718888/assessing-lung-function-using-contrast-enhanced-dual-energy-computed-tomography-for-potential-applications-in-radiation-therapy
#19
Andréanne Lapointe, Houda Bahig, Danis Blais, Hugo Bouchard, Édith Filion, Jean-François Carrier, Stéphane Bedwani
PURPOSE: There is an increasing interest in the evaluation of lung function from physiological images in radiation therapy treatment planning to reduce the extent of postradiation toxicities. The purpose of this work was to retrieve reliable functional information from contrast-enhanced dual-energy computed tomography (DECT) for new applications in radiation therapy. The functional information obtained by DECT is also compared with other methods using single-energy CT (SECT) and single-photon emission computed tomography (SPECT) with CT...
October 2017: Medical Physics
https://www.readbyqxmd.com/read/28673474/new-developments-and-future-challenges-of-nuclear-medicine-and-molecular-imaging-for-pulmonary-embolism
#20
Pierre-Yves Le Roux, Philippe Robin, Pierre-Yves Salaun
Although widely validated, current tests for pulmonary embolism (PE) diagnosis, i.e. computed tomography pulmonary angiography (CTPA) and V/Q planar scintigraphy, have some limitations. Drawbacks of CTPA include the radiation dose, some contra indications and a rising concern about a possible overdiagnosis/overtreatment of PE. On the other hand, V/Q planar scintigraphy has a high rate of non-diagnostic tests responsible for complex diagnostic algorithms. Since the PIOPED study, imaging equipment and radiopharmaceuticals have greatly evolved allowing the introduction of techniques that improve imaging of lung ventilation and perfusion...
June 27, 2017: Thrombosis Research
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