[en] In radiological apparatus, edge values derived by monitoring the radiation passed through a body along many co-planar paths are subjected to a transformation process, such as a convolution integral or Fourier transform process, in order to evaluate the absorption or transmission coefficients of the elements of a matrix of elements notionally delineated, in the plane of the paths, in the body. The values are inversely transformed to synthesize further edge values, and corresponding ones of the first mentioned and further edge values are compared to derive edge value error signals. The edge value error signals are indicative of errors in the evaluation of said coefficients and they are subjected to the aforementioned transformation process to derive therefrom individual correction signals for the various elements of the matrix

[en] In a method of investigating a body by means of penetrating radiation such as X- or γ-radiation, the energy of the radiation is chosen to be such that the radiation is scattered, rather than absorbed, by the body. The scattered radiation is detected by means of banks of detector means disposed on the opposite side of the body to the source, and the detector means include energy analyzing means to enable the angle of incidence thereon of scattered radiation to be determined

[en] The invention is based on the problem of producing X-ray body section radiography equipment so that the positioning of the patient is simplified taking as compared to the present state of technology. This problem is solved by having the patients support equipment consisting of two supports on separate foundations, with each support being held by a clamp at the end of the housing, so that both supports have their surfaces in one plane. Each support is provided with a conveyor for moving the patient longitudinally. The clamp of one support can be loosened manually and the support with the clamp which can be loosened can be moved on its foundation longitudinally and can be adjusted in height. (orig.)

[en] The invention is based on the problem of producing X-ray body section radiography equipment so that the patients support is not shown in the X-ray photograph. This problem is solved by having the patients support equipment consisting of two supports on separate foundations, with each support being held by a clamp at the end of the housing, so that both supports have their surfaces in one plane. Each support is provided with a conveyor for moving the patient longitudinally, and a small gap is left between the two supports in the housing opening, whose width is at least equal to the thickness of the body section. The scanning X-ray equipment passes through this small gap, so that the patients support equipment is not included. (orig.)

[en] It is shown that the fast digital convolution technique used for parallel x-ray beams can be used also to reconstruct a density function for diverging x-ray beams. This technique when combined with an approximate spatial filter yields good accuracy, a flexibility to cope with noise and a substantial reduction in the x-ray dosage. Finite field transforms and zero-order interpolation can be used also to improve the speed of the x-ray reconstruction process. Tests based on these methods are performed on an ideal phantom. A detailed comparison is made between a system using diverging beams, and a system using parallel beams with simulated data

No abstract available

[en] The paper reports upon the developement of a methhod for the determination of water content, based on the use of dichromatic X-ray scanning absorptiometry. (G.B.)

[en] Radiopharmaceuticals are used in the diagnosis and management of various diseases. There are several reports of adverse reactions related to the use of radiopharmaceuticals, though it is not as common as conventional drugs. Adverse reactions related to radiopharmaceuticals have been not widely reported and documented. In this review, we have tried to summarize the adverse reactions associated with some of the commonly used radiopharmaceuticals. (author)

[en] A framework supporting a radiation source, such as an x-ray tube, and a radiation receptor, such as an x-ray film plate holder, comprises four arms pivotally connected to form a regular parallelogram, a parallel pair of the arms extending outside the parallelogram to pivot points for the radiation source and receptor. The parallelogram is mounted on a rotor whose central axis is parallel to the parallel pair of arms. Two links between another one of the arms and the source and receptor respectively, and parallel to the central axis, hold the axis of the source and receptor aligned on a radiation axis which passes through an isocenter on the central axis as the parallelogram is angularly adjusted in planes parallel to the central axis. The angular adjustment of the parallelogram combined with turning of the parallelogram on the rotor permit the source to radiate through a subject at the isocenter, for example the human heart or brain, from throughout a solid angle while maintaining constant radiological distance between the source and subject and a constant axial alignment of the source and receptor. The radiological magnification may also be kept constant, or the receptor may be adjusted along its axis, in which case a counterweight reciprocating along the transverse arm and connected to the receptor by two cables counterbalances the receptor in all solid angle positions. (auth)

No abstract available