RESUMEN
The role of medical imaging is of major impor¬tance in the follow-up of patients with kidney transplant.There as many and various renal transplant complications. The development of techniques in medical imaging, especially the progression of clinical and biological monitoring improve their detection. In this article, we will remind the diverses complications of renal transplant and their expression in the various imaging modalities, including Doppler ultrasound which remains the principal examination modality.
Le rôle de l'imagerie médicale est primordial dans le suivi des patients greffés rénaux. Les complications du greffon rénal sont diverses et nombreuses. L'avancée des techniques en imagerie dans les dernières décennies, surtout couplée au progrès du suivi clinico-biologique, a permis d'améliorer le seuil de détection de ces complications. Nous rappellerons, dans cet article, les complications du rein transplanté ainsi que leur expression dans les différentes modalités d'imagerie, notamment l'échographie couplée au doppler qui reste l'examen de référence pour cette étude.
Asunto(s)
Enfermedades Renales , Trasplante de Riñón , Angiografía , Humanos , Enfermedades Renales/cirugía , Trasplante de Riñón/efectos adversos , Complicaciones Posoperatorias , UltrasonografíaRESUMEN
There are few hospitals performing kidney transplantation. Thereby the residency in radiodiagnostics does not allow to master the essential skills of follow up kidney transplantation except in the case of staying in such a transplantation center. Furthermore, in the last 20 years the scientific publications related to kidney transplantation were of 31.001 all medical disciplines combined, from which only 1730 (5,6x%) focused on medical imaging. In the same period in medical journals focused on radiology, there was 216.661 articles from which 642 (0,3x%) about kidney transplantation. Even the development of new medical imaging techniques did not contribute to clinical practice in a meaningful way. Here we will make a reminder of medical imaging techniques and their indications in the follow-up after transplantation, emphasizing the contribution of standard ultrasound and doppler.
Rares sont les centres hospitaliers pratiquant la transplantation rénale. De ce fait, la spécialisation en radiodiagnostic ne permet pas d'apprendre à maîtriser les techniques indispensables au suivi du rein greffé, sauf dans le cas du passage des assistants cliniques par un centre de référence. De plus, dans les 20 dernières années, les publications scientifiques se rapportant au rein greffé ont été de 31.001, toutes disciplines médicales confondues dont 1.730 (5,6x%) focalisées sur l'imagerie. Durant la même période, dans les journaux axés sur l'imagerie, il y a eu 216.661 articles dont 642 (0,3x%) sur le transplant rénal. Même le développement de nouvelles techniques en imagerie n'a pas contribué à la pratique clinique d'une manière significative. Dès lors, on fera un rappel des techniques d'imagerie médicale et de leurs indications dans le suivi post-opératoire du greffon, en insistant surtout sur l'apport de l'échographie standard et du doppler.
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Trasplante de Riñón , Ultrasonografía Doppler , Estudios de Seguimiento , Humanos , Riñón , UltrasonografíaRESUMEN
We present a measurement of angular observables and a test of lepton flavor universality in the BâK^{*}â^{+}â^{-} decay, where â is either e or µ. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb^{-1} containing 772×10^{6} BB[over ¯] pairs, collected at the Ï(4S) resonance with the Belle detector at the asymmetric-energy e^{+}e^{-} collider KEKB. The result is consistent with standard model (SM) expectations, where the largest discrepancy from a SM prediction is observed in the muon modes with a local significance of 2.6σ.
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We report the first observation of the radiative charm decay D^{0}âρ^{0}γ and the first search for CP violation in decays D^{0}âρ^{0}γ, Ïγ, and K[over ¯]^{*0}(892)γ, using a data sample of 943 fb^{-1} collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The branching fraction is measured to be B(D^{0}âρ^{0}γ)=(1.77±0.30±0.07)×10^{-5}, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries A_{CP}(D^{0}âρ^{0}γ)=+0.056±0.152±0.006, A_{CP}(D^{0}âÏγ)=-0.094±0.066±0.001, and A_{CP}(D^{0}âK[over ¯]^{*0}γ)=-0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D^{0}âÏγ)=(2.76±0.19±0.10)×10^{-5} and B(D^{0}âK[over ¯]^{*0}γ)=(4.66±0.21±0.21)×10^{-4}.
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We report a study of the decay D^{0}âK_{S}^{0}K_{S}^{0} using 921 fb^{-1} of data collected at or near the Ï(4S) and Ï(5S) resonances with the Belle detector at the KEKB asymmetric energy e^{+}e^{-} collider. The measured time-integrated CP asymmetry is A_{CP}(D^{0}âK_{S}^{0}K_{S}^{0})=(-0.02±1.53±0.02±0.17)%, and the branching fraction is B(D^{0}âK_{S}^{0}K_{S}^{0})=(1.321±0.023±0.036±0.044)×10^{-4}, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode (D^{0}âK_{S}^{0}π^{0}). These results are significantly more precise than previous measurements available for this mode. The A_{CP} measurement is consistent with the standard model expectation.
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We report the first evidence for isospin violation in BâK^{*}γ and the first measurement of the difference of CP asymmetries between B^{+}âK^{*+}γ and B^{0}âK^{*0}γ. This analysis is based on the data sample containing 772×10^{6}BB[over ¯] pairs that was collected with the Belle detector at the KEKB energy-asymmetric e^{+}e^{-} collider. We find evidence for the isospin violation with a significance of 3.1σ, Δ_{0+}=[+6.2±1.5(stat)±0.6(syst)±1.2(f_{+-}/f_{00})]%, where the third uncertainty is due to the uncertainty on the fraction of B^{+}B^{-} to B^{0}B[over ¯]^{0} production in Ï(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries is ΔA_{CP}=[+2.4±2.8(stat)±0.5(syst)]%, consistent with zero. The measured branching fractions and CP asymmetries for charged and neutral B meson decays are the most precise to date. We also calculate the ratio of branching fractions of B^{0}âK^{*0}γ to B_{s}^{0}âÏγ.
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Through the case report of a child who had had a congenital diaphragmatic hernia (cdh) and then relapsed 8 months after initial surgery, the various risk factors related to a cdh, its pre- and postnatal management as well as some long-term complications are discussed.
Par le biais du cas clinique d'un enfant qui a été opéré d'une hernie diaphragmatique congénitale (HDC) et qui a récidivé 8 mois plus tard, les différents facteurs de risques liés à la HDC, sa prise en charge ante et post-natale ainsi que quelques possibles complications à long terme sont discutés.
Asunto(s)
Hernias Diafragmáticas Congénitas/diagnóstico por imagen , Hernias Diafragmáticas Congénitas/cirugía , Humanos , Lactante , Masculino , RecurrenciaRESUMEN
We report the first observation of the decay Λ_{c}^{+}âpK^{+}π^{-} using a 980 fb^{-1} data sample collected by the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. This is the first observation of a doubly Cabibbo-suppressed decay of a charmed baryon. We measure the branching ratio of this decay with respect to its Cabibbo-favored counterpart to be B(Λ_{c}^{+}âpK^{+}π^{-})/B(Λ_{c}^{+}âpK^{-}π^{+})=(2.35±0.27±0.21)×10^{-3}, where the uncertainties are statistical and systematic, respectively.
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Using data collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider, we measure the energy dependence of the e^{+}e^{-}âh_{b}(nP)π^{+}π^{-} (n=1, 2) cross sections from thresholds up to 11.02 GeV. We find clear Ï(10860) and Ï(11020) peaks with little or no continuum contribution. We study the resonant substructure of the Ï(11020)âh_{b}(nP)π^{+}π^{-} transitions and find evidence that they proceed entirely via the intermediate isovector states Z_{b}(10610) and Z_{b}(10650). The relative fraction of these states is loosely constrained by the current data: The hypothesis that only Z_{b}(10610) is produced is excluded at the level of 3.3 standard deviations, while the hypothesis that only Z_{b}(10650) is produced is not excluded at a significant level.
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We report the analysis of the three-body e^{+}e^{-}âBB[over ¯]π^{±}, BB[over ¯]^{*}π^{±}, and B^{*}B[over ¯]^{*}π^{±} processes, including the first observations of the Z_{b}^{±}(10610)â[BB[over ¯]^{*}+c.c.]^{±} and Z_{b}^{±}(10650)â[B^{*}B[over ¯]^{*}]^{±} transitions that are found to dominate the corresponding final states. We measure Born cross sections for the three-body production of σ(e^{+}e^{-}â[BB[over ¯]^{*}+c.c.]^{±}π^{∓})=[17.4±1.6(stat)±1.9(syst)] pb and σ(e^{+}e^{-}â[B^{*}B[over ¯]^{*}]^{±}π^{∓})=[8.75±1.15(stat)±1.04(syst)] pb and set a 90% C.L. upper limit of σ(e^{+}e^{-}â[BB[over ¯]]^{±}π^{∓})<2.9 pb. The results are based on a 121.4 fb^{-1} data sample collected with the Belle detector at a center-of-mass energy near the Ï(10860) peak.
RESUMEN
We measure the decay B_{s}^{0}âK^{0}K[over ¯]^{0} using data collected at the Ï(5S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. The data sample used corresponds to an integrated luminosity of 121.4 fb^{-1}. We measure a branching fraction B(B_{s}^{0}âK^{0}K[over ¯]^{0})=[19.6_{-5.1}^{+5.8}(stat)±1.0(syst)±2.0(N_{B_{s}^{0}B[over ¯]_{s}^{0}})]×10^{-6} with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.
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The dark photon A^{'} and the dark Higgs boson h^{'} are hypothetical constituents featured in a number of recently proposed dark sector models. Assuming prompt decays of both dark particles, we search for their production in the so-called Higgstrahlung channel e^{+}e^{-}âA^{'}h^{'}, with h^{'}âA^{'}A^{'}. We investigate ten exclusive final states with A^{'}âe^{+}e^{-}, µ^{+}µ^{-}, or π^{+}π^{-} in the mass ranges 0.1 GeV/c^{2}
RESUMEN
We report the first observation of the decays B^{0}âpΛ[over ¯]D^{(*)-}. The data sample of 711 fb^{-1} used in this analysis corresponds to 772×10^{6} BB[over ¯] pairs, collected at the Ï(4S) resonance by the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We observe 19.8σ and 10.8σ excesses of events for the two decay modes and measure the branching fractions of B^{0}âpΛ[over ¯]D^{-} and B^{0}âpΛ[over ¯]D^{*-} to be (25.1±2.6±3.5)×10^{-6} and (33.6±6.3±4.4)×10^{-6}, respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the dibaryon (pΛ[over ¯]) system is observed, consistent with that observed in similar B decays.
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Using a sample of 771.6×10(6) ÏÏ(4S) decays collected by the Belle experiment at the KEKB e(+)e(-) collider, we observe, for the first time, the transition Ï(4S)âηh(b)(1P) with the branching fraction B[Ï(4S)âηh(b)(1P)]=(2.18±0.11±0.18)×10(-3) and we measure the h(b)(1P) mass M(h(b)(1P))=(9899.3±0.4±1.0) MeV/c(2), corresponding to the hyperfine (HF) splitting ΔM(HF)(1P)=(0.6±0.4±1.0) MeV/c(2). Using the transition h(b)(1P)âγη(b)(1S), we measure the η(b)(1S) mass M(η(b)(1S))=(9400.7±1.7±1.6) MeV/c(2), corresponding to ΔM(HF)(1S)=(59.6±1.7±1.6) MeV/c(2), the η(b)(1S) width Γ(η(b)(1S))=(8(-5)(+6)±5) MeV/c(2) and the branching fraction B[h(b)(1P)âγη(b)(1S)]=(56±8±4)%.
RESUMEN
We observe D(0)-D(0) mixing in the decay D(0) â K+π- using a data sample of integrated luminosity 976 fb(-1) collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. We measure the mixing parameters x'(2) = (0.09 ± 0.22) × 10(-3) and y'=(4.6 ± 3.4) × 10(-3) and the ratio of doubly Cabibbo-suppressed to Cabibbo-favored decay rates R(D) = (3.53 ± 0.13) × 10(-3), where the uncertainties are statistical and systematic combined. Our measurement excludes the no-mixing hypothesis at the 5.1 standard deviation level.
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The e(+)e(-) â π(+)π(-)π(0)χ(bJ) (J = 0,1,2) processes are studied using a 118 fb(-1) data sample acquired with the Belle detector at a center-of-mass energy of 10.867 GeV. Unambiguous π(+)π(-)π(0)χ(bJ) (J = 1,2), ωχ(b1) signals are observed, and indication for ωχ(b2) is seen, both for the first time, and the corresponding cross section measurements are presented. No significant π(+)π(-)π(0)χ(b0) or ωχ(b0) signals are observed, and 90% confidence level upper limits on the cross sections for these two processes are obtained. In the π(+)π(-)π(0) invariant mass spectrum, significant non-ω signals are also observed. We search for the X(3872)-like state (named X(b)) decaying into ωÏ(1S); no significant signal is observed with a mass between 10.55 and 10.65 GeV/c(2).
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We present the first model-independent measurement of the absolute branching fraction of the Λ(c)(+) â pK(-)π(+) decay using a data sample of 978 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The number of Λ(c)(+) baryons is determined by reconstructing the recoiling D((*)-) pπ(+) system in events of the type e(+)e(-) â D((*)-) pπ(+)Λ(c)(+). The branching fraction is measured to be B(Λ(c)(+) â pK(-)π(+)) = (6.84 ± 0.24(-0.27)(+0.21))%, where the first and second uncertainties are statistical and systematic, respectively.
RESUMEN
The lifetime of the τ lepton is measured using the process e+ e- â τ+ τ- , where both τ leptons decay to 3πν(τ). The result for the mean lifetime, based on 711 fb(-1) of data collected with the Belle detector at the Ï(4S) resonance and 60 MeV below, is τ=(290.17±0.53(stat)±0.33(syst))×10(-15) s. The first measurement of the lifetime difference between τ+ and τ- is performed. The upper limit on the relative lifetime difference between positive and negative τ leptons is |Δτ|/τ<7.0×10(-3) at 90% C.L.
Asunto(s)
Partículas Elementales , Modelos Teóricos , Física Nuclear/métodos , Teoría CuánticaRESUMEN
We report measurements of Bâχ(c1)γK and χ(c2)γK decays using 772×10(6) BB[over ¯] events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. Evidence of a new resonance in the χ(c1)γ final state is found with a statistical significance of 3.8σ. This state has a mass of 3823.1±1.8(stat)±0.7(syst) MeV/c(2), a value that is consistent with theoretical expectations for the previously unseen 1(3)D(2) cc[over ¯] meson. We find no other narrow resonance and set upper limits on the branching fractions of the X(3872)âχ(c1)γ and χ(c2)γ decays.
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Measurements of inclusive differential cross sections for charged pion and kaon production in e+ e- annihilation have been carried out at a center-of-mass energy of sqrt[s]=10.52 GeV. The measurements were performed with the Belle detector at the KEKB e+ e- collider using a data sample containing 113×10(6) e+ e- â qq events, where q={u,d,s,c}. We present charge-integrated differential cross sections dσ(h±)/dz for h±={π±,K±} as a function of the relative hadron energy z=2E(h)/sqrt[s] from 0.2 to 0.98. The combined statistical and systematic uncertainties for π± (K±) are 4% (4%) at zâ¼0.6 and 15% (24%) at zâ¼0.9. The cross sections are the first measurements of the z dependence of pion and kaon production for z>0.7 as well as the first precision cross section measurements at a center-of-mass energy far below the Z0 resonance used by the experiments at LEP and SLC.