An imaging apparatus configured for improved depiction of an intervention device and body tissue surrounding said device using a single imaging modality, said apparatus comprising: image acquisition and formation circuitry configured for interrogating a subject that includes said intervention device and said tissue and for using, for a parameter, a parameter value better suited to one or the other of a device region depicting said intervention device and a tissue region depicting said tissue, to yield respectively either in a first transmit mode a first image or in a second transmit mode a second image; image combination circuitry configured for forming, jointly from said first image and said second image which are both of said single modality, a combination that is an image of said intervention device depicted as surrounded by said tissue, wherein said jointly forming includes: (i) segmenting out, from said first image, an image of said intervention device and overlaying the image segmented out onto said second image, or (ii) segmenting out, from said second image, an image of said tissue and overlaying the image segmented out onto said first image, so that said combination being such that there exists, in said combination, between said intervention device and said tissue, a border, and inside and outside said border, respective neighborhoods, such that the inside neighborhood is part of said first image and such that the outside neighborhood is part of said second image; and control circuitry configured for dynamically and repeatedly invoking the image acquisition and formation circuitry to toggle back and forth between the two transmit modes and for dynamically invoking the image combination circuitry to dynamically and repeatedly produce, via the jointly forming from pairs of first and second images, combinations that are each an image of said intervention device depicted as surrounded by said tissue; wherein said single imaging modality is ultrasound and said parameter is a central frequency, and wherein the parameter value used is higher for the first transmit mode, for acquiring the first image, than for the second transmit mode, for acquiring the second image. image acquisition and formation circuitry configured for interrogating a subject that includes said intervention device and said tissue and for using, for a parameter, a parameter value better suited to one or the other of a device region depicting said intervention device and a tissue region depicting said tissue, to yield respectively either in a first transmit mode a first image or in a second transmit mode a second image; image combination circuitry configured for forming, jointly from said first image and said second image which are both of said single modality, a combination that is an image of said intervention device depicted as surrounded by said tissue, wherein said jointly forming includes: (i) segmenting out, from said first image, an image of said intervention device and overlaying the image segmented out onto said second image, or (ii) segmenting out, from said second image, an image of said tissue and overlaying the image segmented out onto said first image, (i) segmenting out, from said first image, an image of said intervention device and overlaying the image segmented out onto said second image, or (ii) segmenting out, from said second image, an image of said tissue and overlaying the image segmented out onto said first image, so that said combination being such that there exists, in said combination, between said intervention device and said tissue, a border, and inside and outside said border, respective neighborhoods, such that the inside neighborhood is part of said first image and such that the outside neighborhood is part of said second image; and control circuitry configured for dynamically and repeatedly invoking the image acquisition and formation circuitry to toggle back and forth between the two transmit modes and for dynamically invoking the image combination circuitry to dynamically and repeatedly produce, via the jointly forming from pairs of first and second images, combinations that are each an image of said intervention device depicted as surrounded by said tissue; wherein said single imaging modality is ultrasound and said parameter is a central frequency, and wherein the parameter value used is higher for the first transmit mode, for acquiring the first image, than for the second transmit mode, for acquiring the second image.