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The 16S rRNA gene of members of the family Helicobacteraceae was amplified by PCR using primers C97-C98 [ 16], followed by a nested PCR using the internal pair of primers HelF-HelR2 [ 17].
Twentypercentt of the reaction was used for a second amplification round with the internal pair of primers (D1: 5′-CGC AAG AAG CGT CTA GCC AT-3′ and D2: 5′-ACT CTA CTA GCA GTC TCG CG-3′).
Twentypercentt of the reaction was taken for a second amplification round (35 cycles) with the internal pair of primers (D1: 5'-CGC AGA AAG CGT CTA GCC AT -3' and D2: 5' -ACT CGG CTA GCA GTC TCG CG -3').
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While this rate of internal pair production is very small, there is a detectable peak of 511 keV photons which exceeds the continuous spectrum of bremsstrahlung photons and these 511 keV photons can be detected and imaged using conventional PET imaging [ 66].
As mentioned before, the branching ratio of internal pair creation for 90Zr is remarkably small compared to usual PET tracers.
On the macroscopic level, post-therapeutic 90Y bremsstrahlung imaging has the poorest resolution and contrast recovery [22,33-35], followed by pre-therapeutic 99mTc-macro-aggregated albumin (99mTc-MAA) SPECT [23-25 [23-25ET imaging, which is possible due to the small, but sufficient, contribution of internal pair production for positron emission [5,26,27,36-42].
A thorough explanation of the emission of β+ particles via internal pair production in the 0+ 0+ transition of 90Zr is provided elsewhere [14].
It is worth noting that the ability of a PET scanner to perform accurate 90Y quantification relies on the knowledge of the internal pair production branching ratio.
PET detection of Y internal pair production represents a promising approach for even more accurate Y quantification in vitro and in vivo by minimizing the previously noted challenges associated with Y bremsstrahlung imaging [ 67].
In particular, we make use of posterior probabilities such as base-pairing probabilities and hybridization probabilities for scores of internal pairs and those of external pairs, respectively, to incorporate further structural information into the objective function as in the case of LARA (Bauer et al., 2007).
Yttrium-90 (90Y) positron emission tomography with integrated computed tomography (PET/CT) represents a technological leap from 90Y bremsstrahlung single-photon emission computed tomography with integrated computed tomography (SPECT/CT) by coincidence imaging of low abundance internal pair production.
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