\nstandard-of-care scans we perform every day,” Pain said in an EANM news release. “That was the
\nstriking finding: even when we cut the acquisition time by 90%, image quality exceeded current
\nstandard-of-care methods.”<\/p>\n
![\"Bar](\"https:\/\/rtmedical.com.br\/wp-content\/uploads\/2026\/10\/total-body-pet-acquisition-time-image-quality.png\")
How the study was built<\/h2>\n
Twenty-four patients scheduled for oncological PET\/CT took part, each receiving one of five
\nradiotracers. Every participant had a standard-of-care scan on a conventional short-axial-field-of-view
\n(SA-FOV) system and, immediately afterwards, a 10-minute acquisition on the long-axial-field-of-view
\n(LA-FOV) Omni Legend 128 from GE HealthCare \u2014 a scanner with a 128 cm axial field of view that
\ncovers essentially the whole body in a single bed position.<\/p>\n
From the raw data of that single 10-minute acquisition, the researchers reconstructed images
\nequivalent to 5, 3, 2 and 1 minute of counting time. Two nuclear medicine specialists, blinded to
\nacquisition time, graded each set on a five-point scale for overall diagnostic quality, sharpness,
\nlesion conspicuity (how clearly a lesion stands out from surrounding tissue) and image noise.<\/p>\n
The numbers behind the headline<\/h2>\n
Mean diagnostic quality scores were 5.0 for the 10- and 5-minute reconstructions, 4.9 for the
\n3- and 2-minute reconstructions and 4.5 for the 1-minute set. Conventional PET\/CT scored 3.9 and
\nposted lower averages than the LA-FOV system across every assessed category and every acquisition
\ntime. Put plainly: the most aggressive reconstruction on the new scanner still read better than a
\nfull-length exam on the old one.<\/p>\n
It is worth saying why that is physically plausible. A PET scanner detects annihilation photon
\npairs in coincidence; the longer the axial field, the larger the solid angle covered and the greater
\nthe fraction of emitted events that actually reaches the detectors. A 128 cm system captures roughly
\nan order of magnitude more counts per unit time than a 20 to 25 cm one. Because signal-to-noise in
\nPET scales approximately with $\\sqrt{N}$, where $N$ is the number of acquired counts, that
\nsensitivity gain can be spent on time, on dose or on image quality \u2014 which is exactly the author’s
\nargument.<\/p>\n
Three currencies, one sensitivity gain<\/h2>\n
“Total-body PET gives us choices we haven’t had before. We can use its sensitivity to scan
\npatients faster, to lower the radiation dose and to see disease more clearly,” Pain said. That is
\nthe right reading: the gain is singular and has to be allocated.<\/p>\n
Shorter scans affect comfort directly, especially for patients in pain or unable to lie still, No department replaces a PET\/CT on the strength of a conference abstract, but the replacement There is a rarely mentioned counterweight. Very short protocols increase departmental load in The author himself drew the boundaries. This is 24 patients, with a subjective reading endpoint Even so, the direction is consistent with what other groups have reported since the first
\nand they cut motion blurring \u2014 a problem we examined when we looked at
\nthe cost of motion-related repeat sequences in MRI<\/a>.
\nThey also raise daily throughput and, through higher sensitivity, allow less radiotracer per
\npatient, which matters economically in departments that depend on short-half-life
\nradiopharmaceuticals.<\/p>\nWhat it means for practice and for the installed base<\/h2>\n
\nconversation shifts when the argument stops being “nicer images” and becomes installed capacity. If
\none scanner does in 2 minutes what another does in 20, the return calculation no longer hinges on
\npurchase price alone: throughput per shift, tracer consumption and the ability to scan patients who
\ncannot tolerate a long protocol all enter the equation.<\/p>\n
\neverything that is not acquisition \u2014 preparation, venous access, uptake time, positioning and
\nreporting \u2014 and those steps do not shrink proportionally. The bottleneck tends to migrate from the
\nscanner room to the schedule. LA-FOV systems also generate larger data volumes per study, with
\ndirect consequences for storage and network, a point we raised when analysing
\nhigh-cost hybrid scanner installations<\/a>.<\/p>\nThe limits of what was shown<\/h2>\n
\nrather than diagnostic accuracy measured against a reference standard. Larger studies will need to
\nconfirm that very short acquisitions do not miss small or faint lesions \u2014 the scenario where
\nreduced counts should hurt most. And it remains to be seen how fast scanning behaves in real
\nworkflow: scheduling, tracer logistics and patient experience do not show up in an image quality
\nscore.<\/p>\n
\nlong-axial-field systems arrived. The debate is no longer whether the extra sensitivity exists, but
\nhow to spend it \u2014 on speed, on dose or on detection. For anyone following
\nthe growing use of PET in targeted diagnostic pathways<\/a>,
\nit is a choice that will keep surfacing in protocol design.<\/p>\n