While CT of the lungs is usually adequate, a positron emission tomography ( PET ) scan of the body may also be performed to search for an occult tumour, particularly of the lung.

While most oil companies were switching to leaded gasolines en masse during the mid-to-late 1920s, American Oil chose to continue marketing its premium-grade " Amoco-Gas " ( later Amoco Super-Premium ) as a lead-free gasoline by using aromatics rather than tetraethyllead to increase octane levels, decades before the environmental movement of the early 1970s led to more stringent auto emission controls which ultimately mandated the universal phase out of leaded gasoline.

While most in the field acknowledges that isoprene emission affects aerosol formation, whether isoprene increases or decreases aerosol formation is debated.

While this thermal emission is very weak, observations at these frequencies are important for characterizing the cold 10-20K dust in the interstellar medium in the Milky Way galaxy, and in distant starburst galaxies.

While the 1970 and 1971 model years initially had the same 1500 cc Ford V4 engine as the Sonett V4, emission control requirements reduced the available horsepower.

While the base does fluoresce in the presence of ionizing radiation, its low yield and negligible transparency to its own emission make the use of fluors necessary in the construction of a practical scintillator.

While the skeptics accept that an accelerating object thermalises at the Unruh temperature, they do not believe that this leads to the emission of photons, arguing that the emission and absorption rates of the accelerating particle are balanced.

While the Stage I 455 in³ ( 7. 5 L ) V8 was somewhat diminished from its performance heyday due to emission controls, the Century GS coupes of 1973 to 1975 remained strong performers by the standards of the time.

While some mandatory emission reduction schemes exclude forest projects, these projects flourish in the voluntary markets.

While most of germanium's radioisotopes decay by beta decay, < sup > 61 </ sup > Ge and < sup > 64 </ sup > Ge decay by β < sup >+</ sup > delayed proton emission.

While the 6x86's integer performance was significantly higher than P5 Pentium's, it's floating point performance was more mediocre — between 2 and 4 times the performance of the 486 FPU per clock cycle ( depending on the operation and precision ).

While motivation can often be used as a tool to help predict behavior, it varies greatly among individuals and must often be combined with ability and environmental factors to actually influence behavior and performance.

While in-role performance tells managers or researchers how well the employee performs the required technical aspects of the job, extra-role performance includes behaviors not necessarily required as part of the job but still contribute to organizational effectiveness.

While there are many sources of error with performance ratings, error can be reduced through rater training and through the use of behaviorally-anchored rating scales.

While these behaviors are not formally part of the job description, performing them can certainly influence performance appraisals.

While the Hungarian team narrowly missed winning the Bronze medal, Polgár finished 10 / 13 for the second highest points total of any player in the Olympiad and a rated performance level of 2772.

While not having the stunning performance as she had in the 2000 Olympiad, she helped Hungary attain the silver medal for the event.

While the capital cost of electrifying track is high, electric trains and locomotives are capable of higher performance and lower operational costs than steam or diesel power.

While the theory of combining multiple arts into one art is quite old, and has been revived periodically, the postmodern manifestation is often in combination with performance art, where the dramatic subtext is removed, and what is left is the specific statements of the artist in question or the conceptual statement of their action.

While these results demonstrate that the poor performance of systems based on first-generation microkernels is not representative for second-generation kernels such as L4, this constitutes no proof that microkernel-based systems can be built with good performance.

While it delivered over four times the per-clock performance of the old-when-released 68020 and 68030, the chip's complexity and power requirements came from a large die and large caches.

While the army held more than its own against the armies of the kingdom's neighbors, its performance against more technologically advanced European armies deteriorated over time.

While the recording took place in a studio, each record of this series has the structure and feel of a live performance, with several first takes on each album.

While the traffic management benefits of migrating to MPLS are quite valuable ( better reliability, increased performance ), there is a significant loss of visibility and access into the MPLS cloud for IT departments.

While this is the only surviving script of a performance, its accuracy is questioned.

While the car was praised for its styling, handling, fuel economy, and reliability, it was harshly written up in the automotive press for its very poor performance, especially in its US spec cars.

While Guildenstern criticizes the Player for his portrayal of death, he believes the Player's performance when Guildenstern thinks he has stabbed him with a knife.

While clock speeds were comparable, the 8-bit databus and cycle stealing of the ZX8301 ULA limited the QL's performance.

While the musical performance was more mainstream, the stage show was another over-the-top spectacle, featuring inflatable giraffes, dancers in eye ball masks illuminating the darkened stage with work lights, and a lead vocalist who seemed to change costumes throughout the show from wearing his eyeball mask to wearing a Richard Nixon mask, and at one point wearing only a wig and fake ears.

While not necessary, emulators and virtual machines can employ hardware support to increase performance of their virtual memory implementations.

While a good performer at low altitudes, without adequate supercharging, the Allison's high-altitude performance was lacking.

While some software developers use the term ISO C, others are standards body – neutral and use Standard C.

While disc players and drives may have capabilities beyond the standards, enabling them to read and write nonstandard discs, there is no assurance, in the absence of explicit additional manufacturer specifications beyond normal Compact Disc logo certification, that any particular player or drive will perform beyond the standards at all or consistently.

While low-quality at first, consumer digital video increased rapidly in quality, first with the introduction of playback standards such as MPEG-1 and MPEG-2 ( adopted for use in television transmission and DVD media ), and then the introduction of the DV tape format allowing recording direct to digital data and simplifying the editing process, allowing non-linear editing systems ( NLE ) to be deployed cheaply and widely on desktop computers with no external playback / recording equipment needed.

While the election was deemed by the European Union election observer team to fall short of international standards for fair and free elections, other teams drew different conclusions.

While the European Union election observer team of Ana Maria Gomes deemed the elections to have fallen short of international standards for fair and free elections, other teams drew totally different conclusions.

While not built to expressway standards, many roads in Addis Ababa and other cities can be considered dual carriageways and have up to four lanes in each direction with hardly any intersections.

While tensions remain ( for example, with Muslim immigrants and in the Basque region ), modern Spain has seen the development of a robust, modern democracy as a constitutional monarchy with popular King Juan Carlos, one of the fastest-growing standards of living in Europe, entry into the European Community, and the 1992 Summer Olympics.

While Codex Alimentarius represents the global standard in particular under the WTO-agreement, member states are free to convert those standards into national regulations.

While some of Euler's proofs are not acceptable by modern standards of mathematical rigour ( in particular his reliance on the principle of the generality of algebra ), his ideas led to many great advances.

While it is often claimed that Standard Macedonian was codified on the base of those dialects ( i. e. the Prilep-Bitola dialect ) which were most unlike Bulgarian, this interpretation stems from the works of Krste Misirkov who suggested that Standard Macedonian should abstract on those dialects " most distinct from the standards of the other Slavonic languages ".

While recognizing that some students will learn certain material faster than others, the standards movement rejects the idea that only a few can succeed.

While the standards for determining whether a body of knowledge, methodology, or practice is scientific can vary from field to field, a number of basic principles are widely agreed upon by scientists.

: While living standards have improved for many, a large number of persons has been pushed to the margin of economic activity especially in the areas which once depended heavily on the banana industry for a livelihood.

While the above two sources are regarded as infallible, the fiqh standards may change in different contexts.

While they suggest covering just a channel access method ( namely a variant of CDMA ), they are actually the common names for the whole air interface standards.

" While expressing its belief in the individual responsibility of citizens and corporations, the party maintains that government plays a " vital role " in establishing and maintaining the highest level of decency in America's community standards.

While this is a phenomenon common to most languages in the world ( for example, spoken English does not always correspond to written standards ), the degree of " correctness " of spoken Indonesian ( in terms of grammar and vocabulary ) by comparison to its written form is noticeably low.

While there are currently no federal drinking water standards for perchlorate, some states have established public health goals, or action levels, and some are in the process of establishing state maximum contaminant levels.

While it is not technically part of the ATSC or DVB broadcast standards as of yet, reports suggest that higher progressive frame rates will feature in the next-generation high-definition television broadcast standards.

While activity in development of IN standards has declined in recent years, there are many systems deployed across the world which use this technology.

While these used a similar format ( MPEG-1 ), due to minor differences between the standards these discs are not compatible with VCD players.

While this decision was popular with web standards advocates, it was largely unpopular with Netscape developers, who were unhappy with the six months given for the rewrite.

While this increases compatibility with many documents designed only for Internet Explorer, some purists argue that it harms the cause of standards evangelism.