Question: Which brands have treatments for SRS or SBRT?
About the article "Radiation therapy", section "Stereotactic radiation".

Candidate passages:
Stereotactic radiation is a specialized type of external beam radiation therapy.
It uses focused radiation beams targeting a well-defined tumor using extremely detailed imaging scans.
Radiation oncologists perform stereotactic treatments, often with the help of a neurosurgeon for tumors in the brain or spine.
There are two types of stereotactic radiation.
Stereotactic radiosurgery (SRS) is when doctors use a single or several stereotactic radiation treatments of the brain or spine.
Stereotactic body radiation therapy (SBRT) refers to one or several stereotactic radiation treatments with the body, such as the lungs.
Some doctors say an advantage to stereotactic treatments are they deliver the right amount of radiation to the cancer in a shorter amount of time than traditional treatments, which can often take six to 11 weeks.
Plus treatments are given with extreme accuracy, which should limit the effect of the radiation on healthy tissues.
One problem with stereotactic treatments is that they are only suitable for certain small tumors.
Stereotactic treatments can be confusing because many hospitals call the treatments by the name of the manufacturer rather than calling it SRS or SBRT.
Brand names for these treatments include Axesse, Cyberknife, Gamma Knife, Novalis, Primatom, Synergy, X-Knife, TomoTherapy, Trilogy and Truebeam.
This list changes as equipment manufacturers continue to develop new, specialized technologies to treat cancers.
SRS or SrS may stand for: 
In general, radiation therapy (or radiotherapy) has developed with a strong reliance on homogeneity of dose throughout the tumor.
Tomotherapy embodies the sequential delivery of radiation to different parts of the tumor which raises two important issues.
First, this method is known as "field matching" and brings with it the possibility of a less-than-perfect match between two adjacent fields with a resultant hot and/or cold spot within the tumor.
The second issue is that if the patient or tumor moves during this sequential delivery, then again, a hot or cold spot will result.
The first problem can be overcome, or at least minimized, by careful construction of the beam delivery system.
The second requires close attention to the position of the target throughout treatment delivery.
All this can be done with during the radiation planning process which makes tomotherapy the most homogeneous radiation treatment delivery machine.
The Corvus tomotherapy system achieved great popularity because it provided a mass market solution to IMRT very early compared to other vendors' systems.
Generally speaking, dose homogeneity is less in IMRT than in 3D conformal radiation therapy which may account for the relative lack of concern regarding the field matching issue.
At this time, the Hi-Art system manufactured by TomoTherapy Inc. is the primary tomotherapy device in use although there are still a number of Corvus systems being used.
TomoTherapy TomoHD systems are also in use.
Other radiation therapy equipment vendors have recently responded to the challenge of short treatment times coupled with a full 360 degree treatment arc by developing methods of delivering IMRT using arcs.
The major difference is that these methods are implemented on standard medical linear accelerators, thereby providing for complete volumetric irradiation.
TomoTherapy "beam on" times are comparable to normal radiation therapy treatment times (about 3–5 minutes beam on time for a common prostate treatment) but do add an additional 2–3 minutes for a daily CT.
The daily CT is used to precisely place the radiation beam and allows the operator to modify the treatment should the patients anatomy change due to weight loss or tumor shrinkage (adaptive radiotherapy).
Lung cancer, head and neck tumors, breast cancer, prostate cancer, stereotactic radiosurgery(SRS) and stereotactic body radiotherapy (SBRT) are some examples of treatments commonly performed using TomoTherapy.
While the first clinical use of TomoTherapy was in 2002, at the University of Wisconsin, under the leadership of Dr. Minesh Mehta, M.D., there are now more than 300 sites across Canada, the United States, Europe and Asia.
Due to their internal shielding and small footprint, TomoTherapy Hi-Art and TomoTherapy TomoHD treatment machines are the only radiotherapy treatment machines used in relocatable radiotherapy treatment suites.
Two different types of suites are available: TomoMobile developed by TomoTherapy Inc. which is a moveable truck and Pioneer, developed by UK-based Oncology Systems Limited.
The latter was developed to meet the requirements of UK and European transport law requirements and is a contained unit that is placed on a concrete pad, delivering radiotherapy treatments in less than five weeks. 
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The Sound Retrieval System (SRS) is a patented psychoacoustic 3D audio processing technology originally invented by Arnold Klayman in the early 1980s.
(The original SRS patents are , and , which expired between 2006 and 2008.
Patents may apply in other countries).
The SRS technology applies head-related transfer functions (HRTFs) to create an immersive 3D soundfield using only two speakers, widening the "sweet spot," creating a more spacious sense of ambience, and producing strong localization cues for discrete instruments within an audio mix.
SRS is not a Dolby matrix surround decoder but works with normal stereo recordings.
Initially Hughes Aircraft, for whom Klayman was doing acoustic consulting at the time, offered a standalone SRS audio processor, as well as licensing the technology to Sony and Thomson (RCA) for inclusion in their products.
In the early 1990s, Hughes sold off its non-aerospace-related holdings, and a group of entrepreneurs formed SRS Labs to acquire the SRS technology.
Many TV sets employ built-in SRS to make their built-in audio systems sound "bigger."
An article in the November 1994 issue of Consumers Digest magazine tested several SRS-equipped sets from Sony and other manufacturers and concluded that the circuit was essentially a gimmick in these products due to their small, close-set speakers and low-wattage amplifiers.
SRS is not a panacea for audio systems that are marginal to begin with; it works best with full-range, high-fidelity sound reproduction.
The company (publicly traded on NASDAQ under the symbol SRSL after a 1996 IPO) since developed or acquired several additional audio technologies, including SRS Headphone, TruSurround XT, TruBass ("psychoacoustic bass enhancement to enable deeper, natural bass of audio source material to be perceived over small speaker drivers"), FOCUS ("sound-image elevation used in combination with SRS to create a large sound image", originally conceived for in-car listening), SRS Virtual Surround, Circle Surround, SRS Wow (an audio-enhancement suite made up of SRS 3D "wide stereo imaging and nonfatiguing headphone listening mode", Focus and TruBass) and SRS Wow HD, Dialog Clarity, and VIP, most using psychoacoustic principles similar to those employed by the SRS technology.
SRS or one of its derivatives is offered in products from a wide range of professional and consumer audio manufacturers as well as in SRS's own small stable of products.
The company derives most of its revenue from licensing its technologies, which it does in both silicon and software form.SRS Wow was implemented in many devices such as music players, and in software such as Microsoft's Windows Media Player for playing sound on a computer.
In 2012 DTS, Inc. acquired the business of SRS Labs, including over 1,000 audio patents and trademarks.