Bruker Analytische Messtechnik Gmbh

Bruker Biospin Gmbh

Bruker Analytik Gmbh

Bruker Medizintechnik Gmbh

Heinz D Zeiger

Baudouin Dillmann

Gunther R Laukien

A radio frequency coil arrangement for magnetic resonance measurements as well as a probe head for measuring resonance signals by utilizing such a radio frequency arrangement are disclosed. The radio frequency coil arrangement comprises a scroll coil having a stripe being spirally wound about a longitudinal axis, and having ends being provided with terminals for feeding and/or receiving radio frequency signals. The stripe, as seen in a plane unwound view, is configured in a Z-shape with a middle, broad section as well as two lateral, narrow sections being offset with respect to each other in a lateral direction, such that the lateral sections do not overlap in the lateral direction when the stripe is wound.

Radio frequency coil arrangement for magnetic resonance measurements and probe head for measuring resonance signals by utilizing such a radio frequency coil arrangement

A probe head for nuclear magnetic resonance measurements is disclosed in which at least a first kind of nuclei with a first, higher resonance frequency and a second kind of nuclei with a second, lower resonance frequency are excited within a magnetic field. The probe head comprises a first input/output terminal for the higher resonance frequency and a second input/output terminal for the lower resonance frequency. A measuring coil cooperates with a sample. The measuring coil has a first terminal end and a second terminal end. The first terminal end is coupled to the first input/output terminal and the second terminal end is coupled to the second input/output terminal. A stop circuit tuned to signals of the higher resonance frequency is arranged between the second terminal end and the second input/output terminal. The stop circuit, further, comprises a line having a length equalling a quarter wave length of the higher resonance frequency. The first line is arranged in series with the measuring coil.

Probe head for nuclear magnetic resonance measurements

A probehead for nuclear magnetic resonance measurements is disclosed. At least a first and a second distinct kind nuclei are excited in a magnetic field. The probehead comprises a measuring coil cooperating with a sample. The coil is connected to a first terminal for feeding a signal of a first frequency for exciting the first kind of nuclei and/or for receiving a resonance signal emitted by nuclei of the first kind of nuclei, and to a second terminal for feeding a signal of a second frequency for exciting the second kind of nuclei and/or for receiving a resonance signal emitted by nuclei of the second kind of nuclei. A radio frequency transmission line of predetermined length is connected to the measuring coil. The transmission line is bridged at about half of its length by a resonance element. The coupling between the measuring coil, the radio frequency transmission line and the resonance element is set to be overcritical, such that a transmission characteristic of the measuring coil has two maxima with frequencies corresponding to the first and to the second frequency.

Probehead for nuclear magnetic resonance measurements

A probe head is used for nuclear resonance measurements during which two different kinds of nuclei are excited by means of radio frequency irradiation in a constant magnetic field. The probe head is provided with a pick-up coil receiving a sample under investigation. The pick-up coil is connected to a first input for feeding a signal of higher frequency for exciting a first kind of nuclei and/or for receiving a resonance signal emitted by the first kind of nuclei. The pick-up coil, further, is connected to a second input for feeding a signal of a lower frequency for exciting a second kind of nuclei and/or for receiving a resonance signal emitted by the second kind of nuclei. The pick-up coil, moreover, is connected to a radio frequency line the electrical length of which corresponds to an integer multiple of a quarter of the wave length of the higher frequency. A series capacitor is interconnected between the radio frequency line and the pick-up coil.

A probehead is described for carrying out magnetic resonance imaging measurements on a sample. The sample is located inside a probehead transmission/detection unit in a magnetic field of a predetermined direction. Moreover, the sample may be turned relative to the direction about at least one axis. The transmission/detection unit is a split ring resonator. The split ring resonator may be turned about its resonator axis and may be coupled by coupling means for coupling rf energy to or from, respectively, the split ring resonator. The coupling means are arranged in a stationary position relative to the split ring resonator and are coaxial to the resonator axis.

Probehead for the measuring of magnetic resonance

A sample head for performing nuclear magnetic resonance measurements on a first kind of nuclei (.sup.1 H) and, further, on a second (.sup.15 N) or a third (.sup.31 P) kind of nuclei within a magnetic field (B) is disclosed. A measuring coil coacts with a sample under analysis and generates a nuclear magnetic resonance within the sample or receives a nuclear magnetic resonance signal from the sample. Terminals are provided for transmitting to or receiving from the measuring coil high-frequency signals having frequencies corresponding to the particular nuclear magnetic resonance frequency of the specific kinds of nuclei (.sup.1 H, .sup.15 N, .sup.31 P), respectively. A high-frequency line is connected to the measuring coil at one end thereof. The line has an electric length which is an integer multiple of a quarter wavelength corresponding to the first, higher frequency. Switching means are associated to the line for switching its electrical length according to two distinct modes of operations where the second and the third, lower frequencies have different values below the first, higher frequency. By actuating the switching means, the line acts as an inductance or as a capacitance, respectively, connected in series with the measuring coil.

Sample head for nuclear resonance measurements

A probehead for a nuclear magnetic resonance spectrometer is disclosed comprising a coil structure defining an axis and having a first, a second, and a third solenoid sub-coil. The sub-coils are switched in parallel and are fed from a common high-frequency source. Adjacent sub-coils are wound in an opposite winding direction. A sample holder is arranged within the center of the middle sub-coil.

Probehead for a nuclear magnetic resonance spectrometer

In order to record nuclear magnetic resonance signals in an area of interest of a sample body which is exposed to a constant magnetic field, a measuring head is applied to a surface of the sample body adjacent the area of interest. The measuring head includes an RF transreceiver unit having a helical line disposed within a shield being open at one of its radial end planes. The helical line is free from connections on one end, and the other end is arranged as an uppermost winding which is electrically connected to the shield via a connection arranged in the open radial end plane. The amplitude of an RF current supplied to a transmitter coil which is arranged coaxially to said measuring head is adjusted to generate an image plane of predetermined constant magnetic RF field strength B at a defined distance above the open radial end plane. The RF current is gated to induce pulsed nuclear magnetic resonance transitions for a predetermined kind of nuclei with respect to the strength of the constant magnetic field. In order to increase the information content of the signals obtained, an image is generated of the two-dimensional distribution of the induced nuclear magnetic transitions within the generated image plans.

Growing community of inventors

Waldbronn, Germany

Heinz D Zeiger