Soft Tissue Intensification in Frontal Roentgenography of the Larynx

The perception of roentgenographic detail is not completely understood but may well be dependent upon the radiation absorption gradient over the contour of a projected structure (WALLS 1954) and its inference by other structures (TUDDENHAM 1957, EDHOLM 1960). The visibility of the soft tissue structure is disturbed and limited by the spongy bone of the cervical vertebrae in frontal roentgenography of the larynx. Structures of low contrast are thus masked by the closely spaced structures of fairly high contrast. Laryngography is the best method of improving the visibility of laryngeal soft tissue (POWERS et coll, 1957, THORNBURY & LATOURETTE 1967, BRINDLE 1966, LANDMAN 1970, HEMMINGSSON 1972, and others). This technique necessitates premedication and anaesthesia with the contrast media used at present; other techniques with a similar diagnostic accuracy but without this disadvantage are therefore desirable.

[1]  K. Rossmann,et al.  Measurement of the Modulation Transfer Function of Radiographic Systems Containing Fluorescent Screens , 1964, Physics in medicine and biology.

[2]  D. A. Mcdonald,et al.  Use of Fourier series for the analysis of biological systems. , 1966, Biophysical journal.

[3]  A. Hemmingsson.  Cervical Phantom for Evaluation of Different Methods of Roentgen Examination of the Larynx , 1971, Acta radiologica: diagnosis.

[4]  Tuddenham Wj,et al.  The visual physiology of roentgen diagnosis; a basic concepts. , 1957 .

[5]  Rockoff Sd.  Radiographic trabecular quantitation of human lumbar vertebrae in situ. I. Theory and method for study of osteoporosis. , 1967 .

[6]  A Hemmingsson,et al.  Optimum Photon Energy in Ordinary Radiography of the Larynx , 1972, Acta radiologica: diagnosis.

[7]  W. Powers,et al.  Contrast examination of the larynx and pharynx. , 1957, Radiology.

[8]  W. J. Tuddenham.  The visual physiology of roentgen diagnosis; a basic concepts. , 1957, The American journal of roentgenology, radium therapy, and nuclear medicine.

[9]  R. Béique,et al.  EFFECT OF FILTRATION IN DIAGNOSTIC RADIOLOGY. , 1965, Journal of the Canadian Association of Radiologists.

[10]  A. Hemmingsson.  Roentgenologic Examination of the Larynx , 1972, Acta radiologica: diagnosis.

[11]  P Edholm,et al.  Elimination of Blur in Linear Tomography , 1970, Acta radiologica: diagnosis.

[12]  K Rossmann,et al.  Modulation transfer function associated with geometrical unsharpness in medical radiography. , 1967, Physics in medicine and biology.

[13]  J. Thornbury,et al.  A comparison study of laryngography techniques. 150 KVP. plain roentgenography vs. positive contrast roentgenography. , 1967, The American journal of roentgenology, radium therapy, and nuclear medicine.

[14]  R. Béique,et al.  SELECTIVE FILTRATION: THE PRACTICAL APPROACH TO HIGH-KILOVOLTAGE RADIOGRAPHY. , 1965, Radiology.

[15]  K. Rossmann.  Some Physical Factors Affecting Image Quality in Medical Radiography , 1964 .

[16]  G L WALLS,et al.  The filling-in process. , 1954, American journal of optometry and archives of American Academy of Optometry.

[17]  P. Edholm,et al.  The Tomogram: Its Formation and Content , 1961, Acta radiologica. Supplementum.

[18]  G. Maguire.  The larynx: simplified radiological examination using heavy filtration and high voltage. , 1966, Radiology.