The diagnostic value of aspiration cytology and the overall diagnostic quality of the so-called triple test (aspiration cytology, mammography and physical examination) in the evaluation of palpable ...breast masses were investigated in a retrospective study. 608 histologically evaluated cancers and 224 benign lesions were investigated. A main purpose of the study was to find out whether the triple diagnostic test can replace surgical biopsy and thereby reduce the number of unnecessary biopsies. All lesions triple-diagnosed as malignant were histologically proved to be malignant, i.e. there were no false positive results. The rate of false negative results was found to be within the range reported for false negative results in fresh frozen sections. Based on these results we state that the dogmatic statement "every palpable mass in the breast must be excised" should be replaced by the recommendation "every palpable mass must be assessed and clarified". A great number of retrospectively unnecessary biopsies can be avoided by a systematic use of the triple diagnosis. The diagnostic safety of this method is close to that of open biopsy. In all cases where positive or negative concordant triplets are found, histological confirmation by biopsy can be avoided. Patients with benign lesions can be thoroughly followed up by repeated physical and radiological examinations. Patients with triple diagnostic malignant results can be adequately treated. Lesions for which triple diagnosis yields neither benign nor malignant, must be biopsied: This is also necessary in all cases with suspicious findings in mammography without a palpable mass, if the equipment for stereotactic or ultrasound- guided biopsies is not available.
A partial-wave analysis of the reaction
p
p→π
0π
0π
0
has been performed using a high-quality high-statistics data set of 712 000 events. In addition to the
f
0(975) and
f
0(1300), the scalar ...resonance with mass
m = (1500 ± 15) MeV and width
Γ = (120 ± 25) MeV is necessary to describe the data.
A partial wave analysis of the reaction
pp
→π
oηη
has been performed, using a high quality, high statistics data set of 198,000 events. In addition to the ƒ
0(1370), a second scalar resonance ...decaying into ηη, the ƒ
0(1500), with mass
m = (1505 ± 15) MeV and width
Γ = (120 ± 30) MeV has to be introduced to describe the data.
The design and construction of the BaBar electromagnetic calorimeter are reviewed. Recent results on the expected sensitivity of the CsI(TI) to radiation damage are discussed. The performance of the ...calorimeter in the first PEP-II run is presented. Particular emphasis is placed on operational experience and the measured degradation due to radiation damage. Correlation of radiation damage with the dose recorded in a novel large-scale array of radiation sensitive FETs are presented. The consequences for the long-term performance of a CsI(TI) calorimeter operating in a high background environment are discussed.
Data samples corresponding to the isospin-violating decay $D_s^{*+}\to D_s^+ \pi^0$ and the decays $D_s^{*+}\to D_s^+\gamma$, $D^{*0}\to D^0\pi^0$ and $D^{*0}\to D^0\gamma$ are reconstructed using ...90.4 ${\rm fb}^{-1}$ of data recorded by the BaBar detector at the PEP-II asymmetric-energy $e^+e^-$ collider. The following branching ratios are extracted: $\Gamma(D_s^{*+}\to D_s^+ \pi^0)/\Gamma(D_s^{*+}\to D_s^+\gamma) = 0.062\pm0.005 ({\rm stat.})\pm0.006 ({\rm syst.})$ and $\Gamma(D^{*0}\to D^0\pi^0)/\Gamma(D^{*0}\to D^0\gamma) = 1.74\pm0.02 ({\rm stat.})\pm0.13 ({\rm syst.})$. Both measurements represent significant improvements over present world averages.
Nucl.Instrum.Meth. A417 (1998) 311-324 A photomultiplier setup for precise relative CsI(Tl) crystal light yield and
uniformity measurements is described. It is used for wrapping material studies
to ...optimize the uniformity and the yield of the light output of 36 cm long
crystals. The uniformity is an important property in high energy photon
calorimetry. Results of an optimization of photodiode coupling to crystals, the
influence of temperature and radiation damage to light and photoelectron yield
are also presented.
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