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Journal articles on the topic 'Doppler'

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1

Rai, Lavanya, and S. Lekshmi. "Value of Third Trimester Uterine Artery Doppler in High-risk Pregnancies for Prediction of Adverse Perinatal Outcome." Journal of South Asian Federation of Obstetrics and Gynaecology 2, no. 1 (2010): 31–35. http://dx.doi.org/10.5005/jp-journals-10006-1056.

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ABSTRACT Objective To determine the usefulness of uterine artery Doppler in evaluation of third trimester high-risk pregnancies in prediction of adverse perinatal outcome. Methods In this prospective study uterine artery Doppler parameters such as PI and early diastolic notch were recorded in a group of 60 high-risk pregnancies mainly consisting of pre-eclampsia and small for gestational age. Uterine artery score (UAS) was calculated from the Doppler parameters and a score ≥ 2 was considered abnormal. Perinatal outcome was then correlated to this score and compared with umbilical artery Dopple
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2

Eden, Alec. "Doppler or doppler?" Ultrasound in Medicine & Biology 16, no. 8 (1990): 827. http://dx.doi.org/10.1016/0301-5629(90)90047-g.

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3

Kremkau, F. "Doppler or doppler?" Ultrasound in Medicine & Biology 16, no. 5 (1990): 524. http://dx.doi.org/10.1016/0301-5629(90)90177-e.

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4

Gong, Jiangkun, Jun Yan, Deren Li, and Deyong Kong. "Detection of Micro-Doppler Signals of Drones Using Radar Systems with Different Radar Dwell Times." Drones 6, no. 9 (2022): 262. http://dx.doi.org/10.3390/drones6090262.

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Not any radar dwell time of a drone radar is suitable for detecting micro-Doppler (or jet engine modulation, JEM) produced by the rotating blades in radar signals of drones. Theoretically, any X-band drone radar system should detect micro-Doppler of blades because of the micro-Doppler effect and partial resonance effect. Yet, we analyzed radar data detected by three radar systems with different radar dwell times but similar frequency and velocity resolution, including Radar−α, Radar−β, and Radar−γ with radar dwell times of 2.7 ms, 20 ms, and 89 ms, respectively. The results indicate that Radar
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5

Zhou, Chang, Zhen-Bo Zhu, and Zi-Yue Tang. "A Novel Waveform Design Method for Shift-Frequency Jamming Confirmation." International Journal of Antennas and Propagation 2018 (July 2, 2018): 1–13. http://dx.doi.org/10.1155/2018/1569590.

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Shift-frequency jamming is generally used to form range false targets for ground-based early-warning radar systems; the frequency shift value of such interference is larger than the Doppler shift value of the moving target, and the key element to suppress the shift-frequency jamming is the frequency shift value estimation. However, in the low- or medium-pulse repetition frequency (PRF) mode, it is challenging to estimate the accurate frequency shift due to the velocity ambiguity. To solve this problem, a novel sparse Doppler-sensitive waveform is designed based on the ambiguity function theory
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6

Eska, Andrita Ceriana. "Doppler Shift Effect at The Communication Systems with 10 GHz around Building." JURNAL INFOTEL 12, no. 4 (2020): 129–33. http://dx.doi.org/10.20895/infotel.v12i4.483.

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This research described the Doppler shift effect for the communication systems. The mobile station moves with various velocities around the building’s environment. Doppler’s shift influences the communication systems. The frequency communication was used 10 GHz and its influenced by atmospheric attenuation. This research consisted of propagation with LOS and NLOS conditions, mobile station velocity variation, height buildings variation, and transmitter power variation. This research described frequency maximum at Doppler shift, coherence time, and signal to noise ratio. More increase Doppler s
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7

Zalud, Ivica, and William Goh. "To Doppler or Not to Doppler: From Doppler Ultrasound to Color Doppler to Doppler in 3D and Beyond." Donald School Journal of Ultrasound in Obstetrics and Gynecology 5, no. 2 (2011): 159–66. http://dx.doi.org/10.5005/jp-journals-10009-1192.

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ABSTRACT This review aims to provide the reader with an update on the present and potential clinical applications in Doppler ultrasound in perinatal medicine. Umbilical artery Doppler plays an important role in the management of intrauterine growth restriction (IUGR) and pre-eclampsia and aids in twin-to-twin transfusion syndrome management while notching in the waveform is a predictor of umbilical cord abnormalities. Middle cerebral artery Doppler reliably detects fetal anemia and may be useful in the assessment of IUGR as well. Abnormal uterine artery Doppler may play a role in predicting gr
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8

Uddin, M. Borhan, S. M. Sorowar Kamal, Abu Bakar Siddique, and Fahmida Shams. "Evaluation of scrotal pathology: an observational study." International Surgery Journal 11, no. 1 (2023): 53–57. http://dx.doi.org/10.18203/2349-2902.isj20233922.

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Background: Scrotal issues often prompt patients to seek evaluation through physical examinations and scrotal ultrasonography. Accurate diagnosis requires a comprehensive exploration of potential conditions, with both grayscale ultrasonography (USG) and duplex Color Doppler ultrasonography employed for assessment. Methods: This prospective observational study, conducted at Dhaka Medical College Hospital in Bangladesh from July 2004 to June 2005, aimed to compare the effectiveness of grayscale ultrasonography and duplex color Doppler ultrasonography in evaluating scrotal pathology. Fifty-two pa
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9

Figueiro-Filho, Ernesto A., Kathryn Versteeg, Jamie Vinken, Alyx Orieux, and Karolina Grzyb. "Association of Low Levels of Placental Growth Factor With Abnormal Fetal Doppler Assessment [ID 2683423]." Obstetrics & Gynecology 143, no. 5S (2024): 65S. http://dx.doi.org/10.1097/01.aog.0001013852.57676.ee.

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INTRODUCTION: Placental growth factor (PlGF) is involved in placental angiogenesis and maturation. Low maternal serum PlGF levels predict placental dysfunction and associated conditions, such as preeclampsia, and fetal growth restriction. These pregnancy complications can lead to abnormal fetal Doppler assessment, indicating progressive fetal deterioration prompting preterm delivery. METHODS: We collected retrospective data from laboratory results of PlGF levels and fetal Dopplers (umbilical artery [UA], middle cerebral artery [MCA], and ductus venosus [DV]) from patients who had clinical indi
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10

Cahoon, Joyce, Wenjing Wang, Yiwen Zhu, et al. "Doppler." Proceedings of the VLDB Endowment 15, no. 12 (2022): 3509–21. http://dx.doi.org/10.14778/3554821.3554840.

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Selecting the optimal cloud target to migrate SQL estates from on-premises to the cloud remains a challenge. Current solutions are not only time-consuming and error-prone, requiring significant user input, but also fail to provide appropriate recommendations. We present Doppler, a scalable recommendation engine that provides right-sized Azure SQL Platform-as-a-Service (PaaS) recommendations without requiring access to sensitive customer data and queries. Doppler introduces a novel price-performance methodology that allows customers to get a personalized rank of relevant cloud targets solely ba
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11

Kremkau, Frederick W. "Doppler." Journal of Diagnostic Medical Sonography 10, no. 6 (1994): 337–38. http://dx.doi.org/10.1177/875647939401000610.

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12

Goh, William A., and Zalud Ivica. "To Doppler or not to Doppler." Journal of obstetrics and women's diseases 64, no. 2 (2015): 84–91. http://dx.doi.org/10.17816/jowd64284-91.

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This review aims to provide the reader with an update on the present and potential clinical applications in Doppler ultrasound in perinatal medicine. Umbilical artery Doppler plays an important role in the management of intrauterine growth restriction (IUGR) and preeclampsia and aids in twin-to-twin transfusion syndrome management while notching in the waveform is a predictor of umbilical cord abnormalities. Middle cerebral artery Doppler reliably detects fetal anemia and may be useful in the assessment of IUGR as well. Abnormal uterine artery Doppler may play a role in predicting growth restr
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13

Huang, Cunshun, Sridhar A. Lahankar, Myung Hwa Kim, Bailin Zhang, and Arthur G. Suits. "Doppler-free/Doppler-sliced ion imaging." Physical Chemistry Chemical Physics 8, no. 40 (2006): 4652. http://dx.doi.org/10.1039/b612324d.

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14

Dang, Qun, and Xiao Li Lei. "Doppler Frequency Shift Tolerance Extension in Burst Spread Spectrum Communication System." Advanced Materials Research 443-444 (January 2012): 237–40. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.237.

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A method to extend Doppler frequency discrimination tolerance is proposed for quick acquirement PN-code and Doppler frequency in TDMA burst spread spectrum communication system. According to Doppler’s different impacts on the correlation Peak and data demodulation, PN-code is acquired through single channel matched-filters, and parallel multi-channel correlators are used in the data demodulation branch channel. Thus, with using frame head prior information in data channel instead of traditional Cross-Product Automatic Frequency Control (CPAFC), the Doppler frequency shift discrimination tolera
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15

Kriskovics, Levente, Zsolt Kövári, Krisztián Vida, Katalin Oláh, and Thorsten A. Carroll. "Doppler images of V1358 Ori." Proceedings of the International Astronomical Union 14, A30 (2018): 135. http://dx.doi.org/10.1017/s1743921319003855.

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AbstractWe present Doppler images of the active dwarf star V1358 Ori using high-resolution spectra from the NARVAL spectropolarimeter mounted on the Bernard Lyot Telescope. The spectra were taken between 09-20 Dec, 2013 with a resolution of R=80000. Doppler imaging was carried out with our new generation multi-line Dopper imaging code iMap (Carroll et al. 2012). 40 individual photospheric lines were selected by line depth, temperature sensitivity and blends. Two data subsets were formed to get two consecutive Doppler images. Prominent cool spots at lower latitudes are found on both maps. At 0.
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16

Musa, Furkan Keskin, Wymeersch Henk, and Koivunen Visa. "MIMO-OFDM Joint Radar-Communications: Is ICI Friend or Foe?" IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING 15, no. 6 (2021): 1393–408. https://doi.org/10.1109/JSTSP.2021.3109431.

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Intercarrier interference (ICI) poses a significant challenge for OFDM joint radar-communications (JRC) systems in high-mobility scenarios. In this paper, we propose a novel ICI-aware sensing algorithm forMIMO-OFDM JRC systems to detect the presence of multiple targets and estimate their delay-Doppler-angle parameters. First, leveraging the observation that spatial covariance matrix is independent of target delays and Dopplers, we perform angle estimation via the MUSIC algorithm. For each estimated angle, we next formulate the radar delay-Doppler estimation as a joint carrier frequency offset
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17

Stritzke, Amelie, Prashanth Murthy, Sharandeep Kaur, et al. "Arterial flow patterns in healthy transitioning near-term neonates." BMJ Paediatrics Open 3, no. 1 (2019): e000333. http://dx.doi.org/10.1136/bmjpo-2018-000333.

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ObjectiveSignificant haemodynamic changes occur at delivery impacting organ blood flow distribution. We aimed to characterise Doppler indices patterns over time in three different organs (brain, gut and kidney) and test them as measures of vascular resistance.DesignObservational cohort study. Serial Doppler interrogations of the anterior cerebral, superior mesenteric and renal arteries within 2 hours, 2–6, and 24 hours of life, in combination with central haemodynamic data.PatientsHealthy, near-term (>36 weeks of gestation) neonates.Outcome measuresPulsatility (PI) and Resistance Indices (R
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18

Gangjun Liu, Gangjun Liu, and and Zhongping Chen and Zhongping Chen. "Advances in Doppler OCT." Chinese Optics Letters 11, no. 1 (2013): 011702–11712. http://dx.doi.org/10.3788/col201311.011702.

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19

Li, Wentao, and Jian Zhou. "Novel laser Doppler tachometer." Chinese Optics Letters 19, no. 1 (2021): 011201. http://dx.doi.org/10.3788/col202119.011201.

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20

Andersson, F. "The Doppler moment transform in Doppler tomography." Inverse Problems 21, no. 4 (2005): 1249–74. http://dx.doi.org/10.1088/0266-5611/21/4/004.

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21

Wang, Fangjian, Angelina Scholz, Joachim Hug, and Christian Rembe. "Laser-Doppler-Dehnungssensor / Laser-Doppler strain gauge." tm - Technisches Messen 86, s1 (2019): 82–86. http://dx.doi.org/10.1515/teme-2019-0043.

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ZusammenfassungIn diesem Beitrag stellen wir einen Lasersensor vor, der die mechanische Dehnung bei der Betriebsfestigkeitsprüfung in Schwingprüfmaschinen kontaktlos misst. Die Auslenkungen an zwei nebeneinanderliegenden Messpunkten in der Dehnungsrichtung werden mit dem Sensor interferometrisch erfasst. Die Differenzauslenkung bezogen auf den Abstand der beiden Messstellen entspricht der Dehnung. Im Vergleich zum Stand der Wissenschaft zeigen wir einen verbesserten Sensoraufbau und ein erweitertes mathematisches Modell. Außerdem werden erstmals Testmessungen mit unserem Versuchsaufbau durchge
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22

Qui, H. H., M. Sommerfeld, and F. Durst. "Two novel Doppler signal detection methods for laser Doppler and phase Doppler anemometry." Measurement Science and Technology 5, no. 7 (1994): 769–78. http://dx.doi.org/10.1088/0957-0233/5/7/002.

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23

Mukhtarov, Sh T., Sh I. Giyasov, and J. M. Yuldashev. "Comparative evaluation of visual-palpatory findings with scrotal doppler ultrasound data for varicocele diagnosis." Urology Herald 12, no. 2 (2024): 58–65. http://dx.doi.org/10.21886/2308-6424-2024-12-2-58-65.

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Introduction. Current evidence suggests that management of any grade of varicocele can improve male fertility. However, diagnosis of grade 1 varicocele in infertile men without the use of scrotal Doppler ultrasound may cause overtreatment.Objective. To study the comparability and accuracy of the visual palpatory examination method with the scrotal Doppler ultrasound data for the diagnosis of varicocele.Material & methods. Between November 2005 to January 2022, 2871 patients diagnosed with varicocele and infertility who underwent microsurgical varicocelectomy by inguinal access were examine
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24

Tian, Boyuan. "The Way to Detect Exoplanetary Systems and the Limitations of the Doppler Method." Theoretical and Natural Science 5, no. 1 (2023): 178–81. http://dx.doi.org/10.54254/2753-8818/5/20230374.

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According to current astronomical developments, Doppler and lensing methods are the two most important methods used by astronomers to detect extrasolar planetary systems. Unlike the lensing method, which requires the use of high-precision astronomical telescopes to measure stellar luminosity variations, the Doppler method can rely on simple stellar redshift phenomena and calculations to accurately predict the existence of extraterrestrial planets, their masses, orbital radii, and other basic characteristics. Therefore, Doppler's method will be the most widely used method to measure planetary s
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25

LaMantia, Kenneth R. "Doppler Echocardiography." Anesthesiology Clinics of North America 6, no. 4 (1988): 785–802. http://dx.doi.org/10.1016/s0889-8537(21)00245-5.

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26

Weiss, Peter. "Doppler Toppler." Science News 164, no. 23 (2003): 358. http://dx.doi.org/10.2307/4018923.

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27

Parashar, SatishK. "Doppler Basics." Journal of The Indian Academy of Echocardiography & Cardiovascular Imaging 4, no. 3 (2020): 378. http://dx.doi.org/10.4103/jiae.jiae_22_20.

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28

DUFFY, DAVID M. "Doppler Commentary." Dermatologic Surgery 28, no. 4 (2002): 362. http://dx.doi.org/10.1097/00042728-200204000-00017.

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29

Dubose, Terry J., and Anthony L. Baker. "Doppler Football." Journal of Diagnostic Medical Sonography 22, no. 2 (2006): 135–37. http://dx.doi.org/10.1177/8756479306286660.

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30

Baron, Scott B., and Keith A. Comess. "Doppler echocardiography." Postgraduate Medicine 87, no. 6 (1990): 85–98. http://dx.doi.org/10.1080/00325481.1990.11716333.

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31

Pellett, Andrew A., William G. Tolar, Darrin G. Merwin, and Edmund K. Kerut. "Doppler Aliasing." Echocardiography 22, no. 6 (2005): 540–43. http://dx.doi.org/10.1111/j.1540-8175.2005.40099.x.

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32

Lin, G. Sharat, Donald T. Milburn, and Sandra Briggs. "Power Doppler." Journal of Diagnostic Medical Sonography 14, no. 4 (1998): 151–61. http://dx.doi.org/10.1177/875647939801400401.

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33

Abrams, J. H., K. D. Holmen, and R. E. Weber. "TRANSTRACHEAL DOPPLER." Anesthesiology 69, no. 3A (1988): A238. http://dx.doi.org/10.1097/00000542-198809010-00237.

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34

ISHII, Shoken. "Doppler Lidar." Wind Engineers, JAWE 34, no. 3 (2009): 341–44. http://dx.doi.org/10.5359/jawe.34.341.

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35

Horrow, Mindy M., Christopher A. DeMauro, and Joanne S. Lee. "Carotid Doppler." Ultrasound Quarterly 24, no. 3 (2008): 155–60. http://dx.doi.org/10.1097/ruq.0b013e3181817c3f.

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36

Marda, Manish, and Hemanshu Prabhakar. "Transcranial Doppler." Journal of Neuroanaesthesiology and Critical Care 02, no. 03 (2015): 215–20. http://dx.doi.org/10.4103/2348-0548.165042.

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AbstractTranscranial Doppler (TCD) is a bedside, non-invasive, reproducible, non-expensive neuromonitoring device which can be used in many clinical scenarios. Based on the principle of the Doppler shift, blood flow velocity (FV) in the cerebral vessels can be measured. It should be noted that TCD measures blood FV and not the cerebral blood flow (CBF). However, in a given condition, FV can be used as a surrogate marker for vessel diameter or CBF. Indirectly, it can also measure the CBF and the intracranial pressure. This review describes briefly the method of using the equipment and the vario
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37

Schwar, Michael. "Doppler debate." Physics World 9, no. 4 (1996): 15. http://dx.doi.org/10.1088/2058-7058/9/4/14.

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38

Hines, Roberta L. "Doppler Echocardiography." Anesthesia & Analgesia 77, no. 4 (1993): 874???875. http://dx.doi.org/10.1213/00000539-199310000-00055.

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39

MD, M. W. "Transcranial Doppler." Neurology 42, no. 10 (1992): 2062. http://dx.doi.org/10.1212/wnl.42.10.2062.

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40

Bernero, Bruce. "Doppler computerized." Physics Teacher 23, no. 5 (1985): 260. http://dx.doi.org/10.1119/1.2341806.

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41

Sullivan, I. D. "Doppler echocardiography." Current Opinion in Cardiology 1, no. 1 (1986): 102–6. http://dx.doi.org/10.1097/00001573-198601000-00019.

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42

Williams, G. "Doppler echocardiography." Current Opinion in Cardiology 1, no. 2 (1986): 237–38. http://dx.doi.org/10.1097/00001573-198603000-00014.

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43

&NA;. "Doppler echocardiography." Current Opinion in Cardiology 1, no. 2 (1986): 315. http://dx.doi.org/10.1097/00001573-198603000-00029.

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44

Leftwich, Heidi K., Bethany Schmidt, Trang Pham, Judith U. Hibbard, and Isabelle Wilkins. "Doppler Ultrasonography." Obstetrics & Gynecology 123 (May 2014): 193S—194S. http://dx.doi.org/10.1097/01.aog.0000447223.21442.41.

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45

Abrams, Jerome H., Roland E. Weber, and Kenneth D. Holmen. "Transtracheal Doppler." Anesthesiology 70, no. 1 (1989): 134–38. http://dx.doi.org/10.1097/00000542-198901000-00025.

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46

Gardin, Julius M. "Doppler Echocardiography." Chest 87, no. 1 (1985): 94–96. http://dx.doi.org/10.1378/chest.87.1.94.

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47

WERKMEISTER, R. "Doppler OCT." Acta Ophthalmologica 92 (August 20, 2014): 0. http://dx.doi.org/10.1111/j.1755-3768.2014.1612.x.

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48

Fearon, Mary, and Kara Lee Rusy. "Transcranial Doppler." Dimensions of Critical Care Nursing 13, no. 5 (1994): 241–48. http://dx.doi.org/10.1097/00003465-199409000-00002.

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49

Snyder, Michael S., and John E. O'Loughlin. "Doppler Echocardiography." Pediatric Annals 16, no. 7 (1987): 580–88. http://dx.doi.org/10.3928/0090-4481-19870701-11.

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50

Piskunov, N. "Doppler imaging." Physica Scripta T133 (December 2008): 014017. http://dx.doi.org/10.1088/0031-8949/2008/t133/014017.

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