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See detailUTILISATION DE L’IMAGERIE FONCTIONNELLE EN RADIOTHÉRAPIE
LALLEMAND, François ULg; LAKOSI, Ferenc ULg; HUSTINX, Roland ULg et al

in Revue Médicale de Liège (2014), 69(Supp 1), 20-28

Les progrès technologiques réalisés par l’image- rie médicale l’ont placée au centre de la prise en charge des patients oncologiques, tant au niveau du diagnostic, du pro - nostic et du suivi que dans la ... [more ▼]

Les progrès technologiques réalisés par l’image- rie médicale l’ont placée au centre de la prise en charge des patients oncologiques, tant au niveau du diagnostic, du pro - nostic et du suivi que dans la prise en charge thérapeutique. En effet, l’imagerie représente, à l’heure actuelle, la pierre angulaire des traitements de radiothérapie. Les objectifs du radiothérapeute sont d’irradier le plus précisément possible la tumeur à dose curative, tout en évitant les organes sains. Pour y arriver, le radiothérapeute utilise de façon routinière l’imagerie anatomique (Scanner et IRM). Depuis quelques années, le développement des différentes imageries métabo - liques et fonctionnelles, comme l’imagerie par émission de positons (PET-CT) et la résonnance magnétique fonctionnelle, ouvrent de nouvelles possibilités thérapeutiques grâce aux informations qu’elles apportent sur la biologie des tumeurs. Cet article décrit, de manière non exhaustive, les différentes imageries anatomiques et métaboliques à la disposition du radiothérapeute. [less ▲]

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See detailBone mass of the calvarium
SIMONI, Paolo ULg; STULKO, Jennifer ULg; BEN MUSTAPHA, Selma ULg et al

in Skeletal Radiology (2013), 42

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See detail18F-fluoride PET/CT for assessing bone involvement in prostate and breast cancers
Withofs, Nadia ULg; Grayet, Benjamin ULg; Tancredi, Tino ULg et al

in Nuclear Medicine Communications (2011), 32(3), 168-176

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See detailImagerie des métastases osseuses du cancer du sein
WITHOFS, Nadia ULg; COLLIGNON, Joëlle ULg; HUSTINX, Roland ULg

in Revue Médicale de Liège (2011), 66(5-6), 291-298

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See detailVers une radiothérapie chirurgicale :nécessité d’une radiothérapie guidée par l’imagerie
COUCKE, Philippe ULg; WITHOFS, Nadia ULg; JANSEN, Nicolas ULg et al

in Revue Médicale de Liège (2010), 65(supp 1), 17-22

résumé : L’évolution extrêmement rapide en robotique et en informatique a permis l’avènement de techniques telles que le CcyberKnife®, capables d’appliquer en radiothérapie des doses dites «ablatives» et ... [more ▼]

résumé : L’évolution extrêmement rapide en robotique et en informatique a permis l’avènement de techniques telles que le CcyberKnife®, capables d’appliquer en radiothérapie des doses dites «ablatives» et ceci avec une précision chirurgicale. Ce type de traitement ablatif n’est pas réellement concevable avec des techniques conventionnelles en radiothérapie et des changements <br />majeurs de paradigmes ont eu lieu, particulièrement dans la méthodologie de définition de la cible et des marges ainsi que dans la manière dont on fractionne le traitement. Ggrâce à ces changements, on est à même de proposer aux patients des traitements <br />qui représentent un doublement au niveau de l’efficacité <br />biologique. Ppour obtenir une couverture optimale au niveau de la cible, tout en évitant les structures saines avoisinantes, il est donc impératif d’obtenir la meilleure définition possible de la cible tant au niveau de la l’extension de la lésion qu’au niveau de son «contenu», c’est-à-dire les caractéristiques métaboliques et fonctionnelles. Lla révolution technologique en cours dans le monde de l’imagerie métabolique et fonctionnelle va permettre d’utiliser l’information numérisée pour individualiser les traitements <br />et les adapter aux caractéristiques mêmes de la lésion ainsi qu’à son évolution au décours du traitement. [less ▲]

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See detailContribution of positron emission tomography in pleural disease.
Duysinx, Bernard ULg; Corhay, Jean-Louis ULg; Larock, Marie-Paule ULg et al

in Revue des Maladies Respiratoires (2010), 27(8), 47-53

INTRODUCTION: Positron emission tomography (PET) now plays a clear role in oncology, especially in chest tumours. We discuss the value of metabolic imaging in characterising pleural pathology in the light ... [more ▼]

INTRODUCTION: Positron emission tomography (PET) now plays a clear role in oncology, especially in chest tumours. We discuss the value of metabolic imaging in characterising pleural pathology in the light of our own experience and review the literature. BACKGROUND: PET is particularly useful in characterising malignant pleural pathologies and is a factor of prognosis in mesothelioma. Metabolic imaging also provides clinical information for staging lung cancer, in researching the primary tumour in metastatic pleurisy and in monitoring chronic or recurrent pleural pathologies. CONCLUSIONS: PET should therefore be considered as a useful tool in the diagnosis of liquid or solid pleural pathologies. [less ▲]

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See detailPET imaging of tumor neovascularization in a transgenic mouse model with a novel 64Cu-DOTA-knottin peptide.
Nielsen, Carsten H; Kimura, Richard H; WITHOFS, Nadia ULg et al

in Cancer Research (2010), 70(22), 9022-30

Due to the high mortality of lung cancer, there is a critical need to develop diagnostic procedures enabling early detection of the disease while at a curable stage. Targeted molecular imaging builds on ... [more ▼]

Due to the high mortality of lung cancer, there is a critical need to develop diagnostic procedures enabling early detection of the disease while at a curable stage. Targeted molecular imaging builds on the positive attributes of positron emission tomography/computed tomography (PET/CT) to allow for a noninvasive detection and characterization of smaller lung nodules, thus increasing the chances of positive treatment outcome. In this study, we investigate the ability to characterize lung tumors that spontaneously arise in a transgenic mouse model. The tumors are first identified with small animal CT followed by characterization with the use of small animal PET with a novel 64Cu-1,4,7,10-tetra-azacylododecane-N,N',N'',N'''-tetraacetic acid (DOTA)-knottin peptide that targets integrins upregulated during angiogenesis on the tumor associated neovasculature. The imaging results obtained with the knottin peptide are compared with standard 18F-fluorodeoxyglucose (FDG) PET small animal imaging. Lung nodules as small as 3 mm in diameter were successfully identified in the transgenic mice by small animal CT, and both 64Cu-DOTA-knottin 2.5F and FDG were able to differentiate lung nodules from the surrounding tissues. Uptake and retention of the 64Cu-DOTA-knottin 2.5F tracer in the lung tumors combined with a low background in the thorax resulted in a statistically higher tumor to background (normal lung) ratio compared with FDG (6.01+/-0.61 versus 4.36+/-0.68; P<0.05). Ex vivo biodistribution showed 64Cu-DOTA-knottin 2.5F to have a fast renal clearance combined with low nonspecific accumulation in the thorax. Collectively, these results show 64Cu-DOTA-knottin 2.5F to be a promising candidate for clinical translation for earlier detection and improved characterization of lung cancer. [less ▲]

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See detailNuclear medicine imaging
Jerusalem, Guy ULg; Withofs, Nadia ULg

in Schmoll, Hans-Joachim; Van't Veer, Laura; Vermorken, Jan (Eds.) et al ESMO Handbook of Cancer Diagnosis and Treatment Evaluation (2009)

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See detailApport de l'imagerie par tomographie a emission de positons dans la pathologie pleurale. Interet de la TEP en pathologie pleurale.
Duysinx, Bernard ULg; Corhay, Jean-Louis ULg; Larock, Marie-Paule et al

in Revue des Maladies Respiratoires (2008), 25(2), 129-38

INTRODUCTION: Positron emission tomography (PET) has a clear role in oncology, particularly in thoracic disease. In the light of our experience and a revue of the literature we define precisely the role ... [more ▼]

INTRODUCTION: Positron emission tomography (PET) has a clear role in oncology, particularly in thoracic disease. In the light of our experience and a revue of the literature we define precisely the role of metabolic imaging in the diagnosis of pleural pathology. BACKGROUND: In particular PET allows characterisation of malignant pleural disease and provides prognostic information in mesothelioma. Metabolic imaging provides clinical information for the staging of pulmonary cancer, in the search for a primary tumour in metastatic pleurisy and also in the follow up of chronic or recurrent pleural pathology. CONCLUSIONS: It is justified, therefore, that PET joins the diagnostic armamentarium of pleural pathology, solid or liquid. [less ▲]

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See detailPET/CT of skull base meningiomas using 2-F-18-fluoro-L-tyrosine: Initial report
Rutten, Isabelle; Cabay, Jean-Evrard ULg; Withofs, Nadia ULg et al

in Journal of Nuclear Medicine (2007), 48(5), 720-725

Precise delineation of the shape of skull base meningiomas is critical for their treatment and follow-up but is often difficult using conventional imaging such as CT and MRI. We report our results with ... [more ▼]

Precise delineation of the shape of skull base meningiomas is critical for their treatment and follow-up but is often difficult using conventional imaging such as CT and MRI. We report our results with PET/CT and 2-(18)F-fluoro-L-tyrosine ((18)F-TYR), a marker of amino acid transport, as part of the yearly follow-up of irradiated patients. METHODS: Eleven patients (mean age, 56.5 y) with skull base meningiomas (n=13 lesions) previously irradiated were included. All patients received 300 MBq of (18)F-TYR and were imaged after 30 min of uptake, using a dedicated PET/CT system. The images were first visually examined, and regions of interest (ROI) were then placed over the transaxial PET slice showing the highest uptake. Another ROI was placed over the normal parietal cortex. Tumor-to-cortex activity ratios were obtained by dividing the maximum pixel value in the tumor ROI by the maximum pixel value in the cortex ROI. The PET/CT images were compared with the MR images obtained as part of routine follow-up. RESULTS: Accumulation of the tracer was higher in all meningiomas than in the surrounding tissue. The tumor-to-cortex activity ratio was 2.53 +/- 0.35 (range, 1.3-6). Nonneoplastic tissue such as hyperemic cavernous sinus did not take up the radionuclide and was therefore easily distinguished from the meningioma. The (18)F-TYR anomalies completely overlapped with the MR image in 54% of the tumors, extended beyond the MRI lesion in 38% of the tumors, and were smaller in 8% of the tumors. CONCLUSION: Meningiomas of the skull base are clearly visualized using (18)F-TYR PET/CT, even after irradiation. In addition to MRI, (18)F-TYR PET/CT images may contribute to the evaluation, delineation, and follow-up of these tumors. [less ▲]

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See detailEffect of dementia severity and age on posterior cingulate cortex metabolism in Alzheimer's disease
Withofs, Nadia ULg; Salmon, Eric ULg; Hallet, Claude ULg et al

in Journal of Neurology (2007, May), 254(Suppl. 3), 146

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See detailTomographie a emission de positons: un premier bilan.
Jerusalem, Guy ULg; Withofs, Nadia ULg; Rorive, Andrée ULg et al

in Revue du Praticien (La) (2007), 57(17), 1864-70

Positron emission tomography (PET) has been widely used for several years for staging and response evaluation in oncology. It is time to critically review its role in routine patient care. [18F]-labelled ... [more ▼]

Positron emission tomography (PET) has been widely used for several years for staging and response evaluation in oncology. It is time to critically review its role in routine patient care. [18F]-labelled fluorodeoxyglucose ([18F]-FDG) remains the radiotracer of choice in most indications. Its high sensitivity, the half-life of 110 minutes and the easy production of this radiotracer explain its routine use although the specificity is not very good. Infectious or inflammatory processes can mimic tumours. Appropriate selection of patients studied in the recommended indications and interpretation of images by an experienced team having access to both clinical information and other diagnostic studies allows reducing the risk of false positives. Although PET is highly accurate, not all patients suffering from cancer need a PET study. Major improvements were also observed with conventional imaging techniques over the past 10 years. It is important to avoid long waiting lists because otherwise treatment delay may counterbalance the benefit of PET studies. [less ▲]

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See detailHeart rate variability in infants with obstructive sleep apnea
Massin, M. M.; Withofs, Nadia ULg; Ravet, Françoise ULg

in Archives de Pédiatrie (2002), 9(4), 444-445

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See detailNormal ranges for the variability in heart rate in young infants while sleeping
Massin, M. M.; Withofs, Nadia ULg; Maeyns, K. et al

in Cardiology in the Young (2001), 11(6), 619-625

Objective: Measurements of the variability in heart rate are increasingly used as markers of cardiac autonomic activity. We sought to establish the development this variability in healthy young infants ... [more ▼]

Objective: Measurements of the variability in heart rate are increasingly used as markers of cardiac autonomic activity. We sought to establish the development this variability in healthy young infants while sleeping. Patients: We carried out polygraphic studies with electrocardiographic recording in 587 healthy infants aged from 5 to 26 weeks. Methods: We determined several variables over a period of 400 minutes sleeping: mean RR interval, 5 time-domain (SDNN, SDNNi, SDANNi, RMSSD, and pNN50) and 5 frequency-domain indexes (spectral power over 3 regions of interest, total power and low-to-high frequency ratio). Frequency-domain indexes were also assessed separately for the periods of quiet sleep and those of rapid eye movement sleep. Results: Our data showed a significant correlation between the indexes of heart rate variability and the mean RR interval, the breathing rate, and the corrected age of the infants. We also demonstrated the importance of the maturation of the sleeping patterns. Conclusion: These data in a large cohort of healthy infants confirm a progressive maturation of the autonomic nervous system during sleep, and may be used to examine the influence of physiological and pathophysiological factors on autonomic control during polygraphic studies. [less ▲]

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See detailThe Influence of Fetal and Postnatal Growth on Heart Rate Variability in Young Infants
Massin, M. M.; Withofs, Nadia ULg; Maeyns, K. et al

in Cardiology (2001), 95(2), 80-3

Heart rate variability (HRV), a measure of cardiac autonomic control, was analyzed in infants to assess the hypothesis that early undernutrition may induce autonomic dysfunction that could play a role in ... [more ▼]

Heart rate variability (HRV), a measure of cardiac autonomic control, was analyzed in infants to assess the hypothesis that early undernutrition may induce autonomic dysfunction that could play a role in the programming of later cardiovascular disease. HRV data were collected during a night session in 546 healthy infants at 5-12 weeks of adjusted age, and statistical associations with fetal and postnatal growth indices were established. A significant positive correlation between birth weight, the ratio of neonatal weight to head circumference and postnatal weight gain, and HRV indices mostly influenced by sympathetic activity was demonstrated in 11- and 12-week-old infants. A slight correlation (p > 0.05) was also found in younger infants. These data suggest the influence of fetal and postnatal growth on the programming of the autonomic nervous system beyond the neonatal period. This influence may be one of the important mechanisms that link impaired growth in fetal and infant life to high blood pressure and other cardiovascular disease during childhood and adulthood (the Barker hypothesis). [less ▲]

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See detailCircadian Rhythm of Heart Rate and Heart Rate Variability
Massin, M. M.; Maeyns, K.; Withofs, Nadia ULg et al

in Archives of Disease in Childhood (2000), 83(2), 179-82

BACKGROUND: Measurements of heart rate variability (HRV) are increasingly used as markers of cardiac autonomic activity. AIM: To examine circadian variation in heart rate and HRV in children. SUBJECTS: A ... [more ▼]

BACKGROUND: Measurements of heart rate variability (HRV) are increasingly used as markers of cardiac autonomic activity. AIM: To examine circadian variation in heart rate and HRV in children. SUBJECTS: A total of 57 healthy infants and children, aged 2 months to 15 years, underwent ambulatory 24 hour Holter recording. Monitoring was also performed on five teenagers with diabetes mellitus and subclinical vagal neuropathy in order to identify the origin of the circadian variation in HRV. METHODS: The following variables were determined hourly: mean RR interval, four time domain (SDNN, SDNNi, rMSSD, and pNN50) and four frequency domain indices (very low, low and high frequency indices, low to high frequency ratio). A chronobiological analysis was made by cosinor method for each variable. RESULTS: A significant circadian variation in heart rate and HRV was present from late infancy or early childhood, characterised by a rise during sleep, except for the low to high frequency ratio that increased during daytime. The appearance of these circadian rhythms was associated with sleep maturation. Time of peak variability did not depend on age. Circadian variation was normal in patients with diabetes mellitus. CONCLUSION: We have identified a circadian rhythm of heart rate and HRV in infants and children. Our data confirm a progressive maturation of the autonomic nervous system and support the hypothesis that the organisation of sleep, associated with sympathetic withdrawal, is responsible for these rhythms. [less ▲]

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