The X-ray Collimator is widely used in clinical applications. It is also used in the applications of collimators for radiographic, fluoroscopic, vascular and cardiovascular systems. The radiation beams are collimated onto the object to be displayed by interfaced X-ray tube, so that we can obtain radiography and fluoroscopy projection images so patient dose and image quality can be determined. The collimators have certain X-ray beam limitations and leakage radiation regulations in order to keep the patient skin dose and the physician's skin dose at a minimum level. It can operate in the temperature range between 10° C to 40° C and can be stored at the temperature range between -40° C to 70° C. The ambient relative humidity range is between 20 to 75%, which is suitable for collimator under operation. A grounding label has not provided at the back of the collimator. The collimator production quality is ensured by verifying various levels of tests. The maximum user protection is achieved by the collimator rail where the loading capability could be at least of 7 kg for vertical load and maximum moment of 15 Nm. It is user-friendly equipment and easily integrates with OEM systems.

Modulation transfer function Radiology

GE HealthCare will accept, for return from customer, items that are in new condition, unworn, unaltered and free of damage. Items cannot be returned or exchanged beyond 30 days from customer’s receipt of the original order and all returned items will be subject to a 15% restocking fee. To obtain a full refund or exchange of the item within the 30 day return period (subject to the 15% restocking fee) customer must request a return materials authorization (RMA) from GE HealthCare and return the item to GE HealthCare utilizing this RMA number. Items must be returned in the original packaging, unused and free of damage.Please note, cuffs, BP items, sterile and hazmat items cannot be returned. If a replacement order is requested, the restocking fee may be waived at GE HealthCare’s sole discretion.

GE HealthCare will accept, for return from customer, items that are in new condition, unworn, unaltered and free of damage. Items cannot be returned or exchanged beyond 30 days from customer’s receipt of the original order and all returned items will be subject to a 15% restocking fee. To obtain a full refund or exchange of the item within the 30 day return period (subject to the 15% restocking fee) customer must request a return materials authorization (RMA) from GE HealthCare and return the item to GE HealthCare utilizing this RMA number. Items must be returned in the original packaging, unused and free of damage.Please note, cuffs, BP items, sterile and hazmat items cannot be returned. If a replacement order is requested, the restocking fee may be waived at GE HealthCare’s sole discretion.

Modulation transfer function

As the MTF is a quantitative and standardized way to characterize optical systems, MTF measurements are commonly used by optical engineers and designers in order to:

On the screenshot below, we can clearly see that this optical system on Figure 2 has aberrations. Indeed, the wavefront is not uniform and the MTF curve (solid line) is not close to the diffraction limit (dotted line).

MTFlens

Mtf measurementformula

In this article we present a MTF measurement performed with a HASO SWIR Shack-Hartmann wavefront sensor manufactured by Imagine Optic SA, a company renowned for its expertise in optical metrology instrumentation for over 25 years. It is combined with the RFLEX accessory which combines a light source and allows an easy double pass set-up.

Below is more information on the equivalent parts. Parts without a hyperlink are listed for reference only and are not available for purchase online.

Mtf measurementpdf

Note that the HASO R-FLEX instrument can also be used to  characterize large optics if combined with the LA ( Large Aperture ) accessory module.

The MTF measurement can be processed from the wavefront map using a double fourier transform. Shack-Hartmann sensors provide the wavefront map in just in a single shot acquisition and therefore provide almost instantaneously a 2D-MTF measurement, offering access to every azimuthal angle.

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The Modulation Transfer Function or MTF measurement is a crucial metrology technique to evaluate how an object’s contrast is captured after passing through an optical system as a function of spatial frequency. It is a critical criteria especially for imaging systems, as it quantifies the imaging quality. The MTF curve is usually compared to the ideal MTF given by a diffraction limited optical system (see Figure 1).

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MTFimage quality

Mtf measurementchart

Don't know your approval number? Call 800-437-1171Enter opt 1 for the first three prompts, and have your System ID available.If you add item(s) to cart and submit your order without the approval number, GE will contact you before your order can be confirmed for shipment.

The X-ray Collimator is widely used in clinical applications. It is also used in the applications of collimators for radiographic, fluoroscopic, vascular and cardiovascular systems. The radiation beams are collimated onto the object to be displayed by interfaced X-ray tube, so that we can obtain radiography and fluoroscopy projection images so patient dose and image quality can be determined. The collimators have certain X-ray beam limitations and leakage radiation regulations in order to keep the patient skin dose and the physician's skin dose at a minimum level. It can operate in the temperature range between 10° C to 40° C and can be stored at the temperature range between -40° C to 70° C. The ambient relative humidity range is between 20 to 75%, which is suitable for collimator under operation. A grounding label has not provided at the back of the collimator. The collimator production quality is ensured by verifying various levels of tests. The maximum user protection is achieved by the collimator rail where the loading capability could be at least of 7 kg for vertical load and maximum moment of 15 Nm. It is user-friendly equipment and easily integrates with OEM systems.

HASO sensor offer a measurement accuracy of  λ/100 rms which translates to a MTF calculation with an accuracy of less than 1 point (1%). Moreover, this measurement solution allows convenient implementation allowing on-axis and off-axis measurements.

For a deeper analysis, WaveView4 can also compute the Point Spread Function (PSF), wavefront aberrations and Zernike or Legendre polynomials.

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Core ExchangePlease ship this returnable part back within 30 calendar days of receipt of your original part shipment. Failure to return the part within 30 calendar days will result in an additional charge. We encourage you to check inventory prior to adding this item to your cart.