The data acquisition system of ClearPET neuro - a small animal PET scanner

Streun, M.; Brandenburg, G.; Larue, H.; Parl, C.; Ziemons, K.

doi:10.1109/tns.2006.875051

Cited by 65 publications

(29 citation statements)

References 6 publications

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“…The data acquisition system of the ClearPET [16] consists of 20 detector cassettes, each comprising 4 PMTs and electronics for trigger, shaping, data-digitization (free-running analog-to-digital converters, ADC, at 40 MHz sampling rate and 12-bit resolution) and transmission. These cassettes transfer their data via fiber optics to five preprocessing PCs (four cassettes per PC) which provide list-mode files with the information of each single photon detected.…”

Section: Methodsmentioning

confidence: 99%

“…Correction for random events was only applied in the ClearPET. The rPET-1 system does not provide correction for randoms; however, at the usual activities in mouse studies (15)(16)(17)(18)(19)(20) MBq) the randoms fraction is below 5% of the total coincidences. The values presented in the image quality test were obtained without applying attenuation or scatter corrections.…”

Section: Image Qualitymentioning

confidence: 99%

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NEMA NU 4-2008 Performance Measurements of Two Commercial Small-Animal PET Scanners: ClearPET and rPET-1

Canadas

Embid

Lage

et al. 2011

IEEE Trans. Nucl. Sci.

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Section: Methodsmentioning

confidence: 99%

Section: Image Qualitymentioning

confidence: 99%

NEMA NU 4-2008 Performance Measurements of Two Commercial Small-Animal PET Scanners: ClearPET and rPET-1

Canadas

Embid

Lage

et al. 2011

IEEE Trans. Nucl. Sci.

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“…Its detectors, frontend electronics and data acquisition architecture are based on the ClearPET TM system (Streun et al, 2006). The detectors are arranged in a horizontal plane to allow the plants to be measured in their natural upright position.…”

Section: Data Collection and Analysis During The Half-girdling Experimentioning

confidence: 99%

Tree Girdling: A Tool to Improve Our Understanding of Coupled Sugar and Water Transport

Schepper¹,

Steppe²

2013

Acta Hortic.

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(max 300 words)Girdling can be used as a valuable research tool to improve our understanding of the integrated water (xylem) and sugar (phloem) transport. Therefore, girdling was applied in two ways on young oak trees (Quercus robur L.): manipulation of the sugar flow by mechanically removing a half band of bark (halfgirdling) and a complete band of bark at two different heights (double girdling). The double girdling effects on both the water and sugar transport were investigated by analysing stem diameter variations, photosynthesis, xylem sap flow and concentrations of carbohydrates. The double-girdled oak trees could be divided in three stem zones: (1) the upper stem zone (U) still receiving new assimilates from the leaves, (2) the lowest stem zone (L) receiving only stored sugars from the roots, and (3) the middle stem zone (M) completely isolated from crown and roots. As downward carbon transport was interrupted by girdling, the stem expansion and carbohydrate content increased in U, indicating that U became the major sink instead of the roots. In contrast to U, stem expansion and carbohydrate content decreased in the two lower stem zones (M and L). Furthermore, a decrease in photosynthesis and sap flow rate was observed, which could be attributed to an indirect girdling effect. In the half-girdled trees, a labelling with radio-active 11 C was applied to visualise the sugar flow in small stem segments. The images of the labelled sugar flows showed that the translocation in the transport phloem was sectorial in both treated and untreated trees. However, half-girdling demonstrated that this sectorial behaviour was plastic and that lateral sugar translocation in the transport phloem was enhanced after wounding. In conclusion, different ways of girdling were successfully applied to test and confirm several in literature proposed hypotheses.

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“…The production and the application of the short lived carbon isotope labelled 11 C-CO 2 through a gas-exchange system has been described by Jahnke et al (2009). Quantitative analysis of the distribution of 11 C-isotope in the root/soil volume was conducted by a PET setup dedicated for plant analysis (PLANTIS) based in the CLEARPET-system (Streun et al 2006) in a coincidence design. Reconstruction used the specifically designed algorithms (Weber et al 2006).…”

Section: Analysis Of Root Structure and Function In Soilmentioning

confidence: 99%

“…Findings obtained in those artificial conditions must be verified in natural substrates at full 3-D resolution. Recently, combinations of MRI and PET have been developed and applied to analyse root and storage structure (MRI) as well as carbon transport properties (PET) in soil (Streun et al 2006;Jahnke et al 2009). In the present study we report on first applications of this co-registration method of MRI and PET to analyse responses of plant roots to environmental challenges emphasising the carbon transport into the root at cool temperatures.…”

Section: Analysis Of Root Structure and Function In Soilmentioning

confidence: 99%

Temperature responses of roots: impact on growth, root system architecture and implications for phenotyping

Nagel

Kastenholz

Jahnke

et al. 2009

Functional Plant Biol.

218

176

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Abstract. Root phenotyping is a challenging task, mainly because of the hidden nature of this organ. Only recently, imaging technologies have become available that allow us to elucidate the dynamic establishment of root structure and function in the soil. In root tips, optical analysis of the relative elemental growth rates in root expansion zones of hydroponically-grown plants revealed that it is the maximum intensity of cellular growth processes rather than the length of the root growth zone that control the acclimation to dynamic changes in temperature. Acclimation of entire root systems was studied at high throughput in agar-filled Petri dishes. In the present study, optical analysis of root system architecture showed that low temperature induced smaller branching angles between primary and lateral roots, which caused a reduction in the volume that roots access at lower temperature. Simulation of temperature gradients similar to natural soil conditions led to differential responses in basal and apical parts of the root system, and significantly affected the entire root system. These results were supported by first data on the response of root structure and carbon transport to different root zone temperatures. These data were acquired by combined magnetic resonance imaging (MRI) and positron emission tomography (PET). They indicate acclimation of root structure and geometry to temperature and preferential accumulation of carbon near the root tip at low root zone temperatures. Overall, this study demonstrated the value of combining different phenotyping technologies that analyse processes at different spatial and temporal scales. Only such an integrated approach allows us to connect differences between genotypes obtained in artificial high throughput conditions with specific characteristics relevant for field performance. Thus, novel routes may be opened up for improved plant breeding as well as for mechanistic understanding of root structure and function.

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The data acquisition system of ClearPET neuro - a small animal PET scanner

Cited by 65 publications

References 6 publications

NEMA NU 4-2008 Performance Measurements of Two Commercial Small-Animal PET Scanners: ClearPET and rPET-1

NEMA NU 4-2008 Performance Measurements of Two Commercial Small-Animal PET Scanners: ClearPET and rPET-1

Tree Girdling: A Tool to Improve Our Understanding of Coupled Sugar and Water Transport

Temperature responses of roots: impact on growth, root system architecture and implications for phenotyping

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