Right ventricular apical pacing (RVAP) with a left bundle branch block on the electrocardiogram may result in regional wall motion abnormalities and decreased left ventricular function (LVF). Furthermore, perfusion defects in dipyridamole technetium-99m-methoxisobutylisonitrile ((99m)Tc-MIBI) myocardial perfusion imaging may occur despite a normal coronary angiogram. In a 68 years old patient, ...

w The major difficulty in albino diagnosis is that although foveal hypoplasii seems a consistent feature, it is not uncommon for an albino to have normal fundus pigmentation, normal iris pigmentation and/or no nystagmus. Only a retina-ge.nicula-coni misprojection seems pathognomonic to albinism since all species of albino mammals share this feature. With appropriate stimulus and recording condi...

We read with interest the recent paper by Shiga et al. published in the European Journal of Nuclear Medicine [1]. The authors report some interesting results concerning the effect of triple-energy window-based scatter correction on brain perfusion SPET using statistical para-metric mapping (SPM) analysis. The research performed is worthwhile and contributes significantly to our understanding of...

Conventional single photon emission computed tomography (SPECT) collimators are not suitable for 511 keV imaging. In order to use a SPECT system for single positron emission tomography (SPET), we need to design high-efficiency collimators capable of absorbing 511 keV photons. Slit slat (SS) collimators have been proposed for this purpose even though the optimization of such collimators has not ...

w The major difficulty in albino diagnosis is that although foveal hypoplasii seems a consistent feature, it is not uncommon for an albino to have normal fundus pigmentation, normal iris pigmentation and/or no nystagmus. Only a retina-ge.nicula-coni misprojection seems pathognomonic to albinism since all species of albino mammals share this feature. With appropriate stimulus and recording condi...

The major advantage of position sensitive radiation detector systems lies in their ability to non invasively map the regional distribution of the emitted radiation in real-time. Three of such detector systems were studied in this thesis, gamma-cameras, positron cameras and CMOS image sensors. A number of physical factors associated to these detectors degrade the qualitative and quantitative pro...