GB2438470A - Pelvic Radiograph Scaling Device - Google Patents

Pelvic Radiograph Scaling Device Download PDF

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Publication number
GB2438470A
GB2438470A GB0610508A GB0610508A GB2438470A GB 2438470 A GB2438470 A GB 2438470A GB 0610508 A GB0610508 A GB 0610508A GB 0610508 A GB0610508 A GB 0610508A GB 2438470 A GB2438470 A GB 2438470A
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United Kingdom
Prior art keywords
pelvic
radiograph
scaling
scaling device
ray
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GB0610508A
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GB0610508D0 (en
GB2438470B (en
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Simon Wimsey
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Individual
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Publication of GB2438470A publication Critical patent/GB2438470A/en
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Publication of GB2438470B publication Critical patent/GB2438470B/en
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
    • G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
    • G03B42/04—Holders for X-ray films
    • G03B42/047—Holders for X-ray films provided with marking means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/12—Arrangements for detecting or locating foreign bodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/3094—Designing or manufacturing processes
    • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/36—Image-producing devices or illumination devices not otherwise provided for
    • A61B2090/363—Use of fiducial points

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Medical Informatics (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Pathology (AREA)
  • Transplantation (AREA)
  • Cardiology (AREA)
  • Vascular Medicine (AREA)
  • Molecular Biology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • High Energy & Nuclear Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Biophysics (AREA)
  • Optics & Photonics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Geometry (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

A pelvic radiograph scaling device which comprises two radio-opaque discs of known size within a radiolucent positioning device, enabling accurate scaling of pelvic radiographs by rotating the device through 4 available disc heights, and placing the device in the x-ray field prior to radiograph acquisition.

Description

<p>I Title</p>
<p>PELVIC RADIOGRAPH SCALING DEVICE</p>
<p>Description</p>
<p>This invention relates to a device which enables accurate scaling of pelvic radiographs.</p>
<p>The process of taking antero-posterior (AP) pelvic x-rays results in a quoted 120% magnification factor. However, due to inaccuracies in x-ray machine set up, variations in patient body habitus and differences in mattress thickness, this magnification value is extremely variable. In fact, the range of magnifications has been shown in our hospital to vary between 109% and 128%, and this mirrors published findings.</p>
<p>When performing hip replacement surgery, specialised acetate templates have traditionally been used which are at a set magnification, usually 120%. These templates are usually a set of clear pieces of acetate film with a range of hip prostheses marked upon them. The idea is that you place these templates upon the x-ray film and decide upon the best-fit hip replacement prior to performing the operation. This will create obvious inaccuracies and potentially lead to the incorrect hip replacement being inserted, if a template at 120% magnification is being used to template an x-ray which may not be at that magnification.</p>
<p>Digital radiography is slowly being introduced nationwide. This confers benefits in that computer templating software is available, enabling on-screen templating to be carried out. However, this does not solve the problem of scaling the radiographs initially.</p>
<p>I propose a simple, accurate, reliable and radiographer friendly method of scaling pelvic radiographs so that appropriate and accurate digital templating can be carried out.</p>
<p>The invention will now be described: A clear perspex (or other radiolucent material) rectangle which contains 2 metal circular discs (radio-opaque) of known diameter (eg 30mm diameter and 2m thick) sandwiched at each end (figure 1 includes dimensions, figure 2 is without).</p>
<p>The centre of one metal disc is 6cm and 12cm from the top and bottom of the rectangle if this is held vertically. The other metal disc is 8cm and 10cm from the top and bottom edges respectively.</p>
<p>These dimensions and measurements enable the rectangle to be rotated and flipped so that one of the metal discs can be 6cm, 8cm, 10cm or 12cm superior to a flat surface.</p>
<p>The radiolucent rectangle therefore acts as a positioning device.</p>
<p>These 4 separate measurements relate to the range of heights that human greater trochanters (part of the hip bone) are from the couch when the patient is lying flat.</p>
<p>The greater trochanter lies in the same plane as the head of the femur.</p>
<p>The simplest way to visualise how the device works is to follow the step-by-step instructions on how to use the device. This is referenced to 3 photographs (figures 3, 4,and5).</p>
<p>With the patient positioned for a pelvic x-ray, the device is placed vertically against the outer edge of the patient's thigh, on the x-ray table and at the height of the palpable greater trochanter (figure 3). The device can be rotated or flipped through 4 different positions until one of the metal discs matches the level of the greater trochanter (which will always be in the range of 6cm to 12cm from the couch surface). The device is then moved and placed between the thighs of the patient as proximal as possible, with the disc which has been selected as best representing the position of the greater trochanter being the more proximal of the two (figure 4). The plain AP pelvic x-ray is then taken as normal. The more proximal disc appears in the AP x-ray in profile just below the bony pelvis. This disc can then be measured on the computer screen digital x-ray and as it is in the plane of interest can be used to scale the image accurately (figure 5).</p>

Claims (1)

  1. <p>Claims 1 -a pelvic radiograph scaling device comprising a radio-opaque
    object of known size within a radiolucent positioning device</p>
GB0610508A 2006-05-25 2006-05-25 Pelvic radiograph scaling device Expired - Fee Related GB2438470B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0610508A GB2438470B (en) 2006-05-25 2006-05-25 Pelvic radiograph scaling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0610508A GB2438470B (en) 2006-05-25 2006-05-25 Pelvic radiograph scaling device

Publications (3)

Publication Number Publication Date
GB0610508D0 GB0610508D0 (en) 2006-07-05
GB2438470A true GB2438470A (en) 2007-11-28
GB2438470B GB2438470B (en) 2011-06-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0610508A Expired - Fee Related GB2438470B (en) 2006-05-25 2006-05-25 Pelvic radiograph scaling device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2460831A (en) * 2008-06-09 2009-12-16 Frank Cook A geometrical method for scaling radiographs

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706883A (en) * 1969-11-21 1972-12-19 Kevin M Mcintyre Radiological apparatus for measuring length which comprises two relatively movable radio opaque marks
US3770956A (en) * 1971-12-30 1973-11-06 Buckbee Mears Co X-ray measuring grid
US4286168A (en) * 1979-01-18 1981-08-25 Atomic Products Corp. Phantom simulation device for scintillation cameras
JPS57202530A (en) * 1981-06-09 1982-12-11 Etsuji Kuroiwa Scale for x-ray photographing
CA1165473A (en) * 1981-12-11 1984-04-10 Philip J. Lowe Standard knee radiograph
US5149965A (en) * 1990-04-23 1992-09-22 Temple University Precision radiography scaling device
US5260985A (en) * 1992-08-14 1993-11-09 Mosby Richard A Conforming localization/biopsy grid and control apparatus
US5970119A (en) * 1997-11-18 1999-10-19 Douglas Holtz (Part Interest) Radiological scaling and alignment device
WO2000058691A1 (en) * 1999-03-18 2000-10-05 Eisenlohr Technologies, Inc. Radiographic reference marker
US6985558B1 (en) * 1993-05-07 2006-01-10 Beekley Corporation Intermediate density marker and a method using such a marker for radiographic examination

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB610454A (en) * 1946-04-05 1948-10-15 Bertie Edgar Ferris Greenaway Improvements in or relating to radiograph measurement scales
US4915112A (en) * 1986-09-30 1990-04-10 The Children's Medical Center Corporation Radiographic measurement device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706883A (en) * 1969-11-21 1972-12-19 Kevin M Mcintyre Radiological apparatus for measuring length which comprises two relatively movable radio opaque marks
US3770956A (en) * 1971-12-30 1973-11-06 Buckbee Mears Co X-ray measuring grid
US4286168A (en) * 1979-01-18 1981-08-25 Atomic Products Corp. Phantom simulation device for scintillation cameras
JPS57202530A (en) * 1981-06-09 1982-12-11 Etsuji Kuroiwa Scale for x-ray photographing
CA1165473A (en) * 1981-12-11 1984-04-10 Philip J. Lowe Standard knee radiograph
US5149965A (en) * 1990-04-23 1992-09-22 Temple University Precision radiography scaling device
US5260985A (en) * 1992-08-14 1993-11-09 Mosby Richard A Conforming localization/biopsy grid and control apparatus
US6985558B1 (en) * 1993-05-07 2006-01-10 Beekley Corporation Intermediate density marker and a method using such a marker for radiographic examination
US5970119A (en) * 1997-11-18 1999-10-19 Douglas Holtz (Part Interest) Radiological scaling and alignment device
WO2000058691A1 (en) * 1999-03-18 2000-10-05 Eisenlohr Technologies, Inc. Radiographic reference marker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2460831A (en) * 2008-06-09 2009-12-16 Frank Cook A geometrical method for scaling radiographs

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Publication number Publication date
GB0610508D0 (en) 2006-07-05
GB2438470B (en) 2011-06-08

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20130525