  Two-particle correlations in high-energy collision experiments enable the
extraction of particle source radii by using the Bose-Einstein enhancement of
pion production at low relative momentum $q\propto 1/R$. It was previously
observed that in $\rm{p}\rm{p}$ collisions at $\sqrt{s}=7$ TeV the average pair
transverse momentum $k_{\rm T}$ range of such analyses is limited due to large
background correlations which were attributed to mini-jet phenomena. To
investigate this further, an event-shape dependent analysis of Bose-Einstein
correlations for pion pairs is performed in this work. By categorizing the
events by their transverse sphericity $S_{\rm T}$ into spherical
$(S_\textrm{T}>0.7)$ and jet-like $(S_\textrm{T}<0.3)$ events a method was
developed that allows for the determination of source radii for much larger
values of $k_{\rm T}$ for the first time. Spherical events demonstrate little
or no background correlations while jet-like events are dominated by them. This
observation agrees with the hypothesis of a mini-jet origin of the
non-femtoscopic background correlations and gives new insight into the physics
interpretation of the $k_{\rm T}$ dependence of the radii. The emission source
size in spherical events shows a substantially diminished $k_{\rm T}$
dependence, while jet-like events show indications of a negative trend with
respect to $k_{\rm T}$ in the highest multiplicity events. Regarding the
emission source shape, the correlation functions for both event sphericity
classes show good agreement with an exponential shape, rather than a Gaussian
one.
